Move gdb_select.h to gdbsupport/

This moves gdb_select.h to gdbsupport/, so it can be used by other
code there.

gdb/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

	* gdb_select.h: Move to ../gdbsupport/.
	* event-loop.c: Update include path.
	* top.c: Update include path.
	* ser-base.c: Update include path.
	* ui-file.c: Update include path.
	* ser-tcp.c: Update include path.
	* guile/scm-ports.c: Update include path.
	* posix-hdep.c: Update include path.
	* ser-unix.c: Update include path.
	* gdb_usleep.c: Update include path.
	* mingw-hdep.c: Update include path.
	* inflow.c: Update include path.
	* infrun.c: Update include path.
	* event-top.c: Update include path.

gdbsupport/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

	* gdb_select.h: Move from ../gdb/.

15 files changed, 33 insertions, 13 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index c0ac384..d8be389 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,22 @@
 2020-04-13  Tom Tromey  <tom@tromey.com>
 
+	* gdb_select.h: Move to ../gdbsupport/.
+	* event-loop.c: Update include path.
+	* top.c: Update include path.
+	* ser-base.c: Update include path.
+	* ui-file.c: Update include path.
+	* ser-tcp.c: Update include path.
+	* guile/scm-ports.c: Update include path.
+	* posix-hdep.c: Update include path.
+	* ser-unix.c: Update include path.
+	* gdb_usleep.c: Update include path.
+	* mingw-hdep.c: Update include path.
+	* inflow.c: Update include path.
+	* infrun.c: Update include path.
+	* event-top.c: Update include path.
+
+2020-04-13  Tom Tromey  <tom@tromey.com>
+
 	* configure: Rebuild.
 	* configure.ac: Remove checks that are now in GDB_AC_COMMON.
 
diff --git a/gdb/event-loop.c b/gdb/event-loop.c
index 36df476..ae9d27e 100644
--- a/gdb/event-loop.c
+++ b/gdb/event-loop.c
@@ -32,8 +32,7 @@
 
 #include <sys/types.h>
 #include "gdbsupport/gdb_sys_time.h"
-#include "gdb_select.h"
-#include "observable.h"
+#include "gdbsupport/gdb_select.h"
 #include "top.h"
 
 /* Tell create_file_handler what events we are interested in.
diff --git a/gdb/event-top.c b/gdb/event-top.c
index 1bfc28e..965ecd5 100644
--- a/gdb/event-top.c
+++ b/gdb/event-top.c
@@ -39,7 +39,7 @@
 #include "maint.h"
 #include "gdbsupport/buffer.h"
 #include "ser-event.h"
-#include "gdb_select.h"
+#include "gdbsupport/gdb_select.h"
 #include "gdbsupport/gdb-sigmask.h"
 
 /* readline include files.  */
diff --git a/gdb/guile/scm-ports.c b/gdb/guile/scm-ports.c
index 3f832dc..407d1d3 100644
--- a/gdb/guile/scm-ports.c
+++ b/gdb/guile/scm-ports.c
@@ -22,7 +22,7 @@
    conventions, et.al.  */
 
 #include "defs.h"
-#include "gdb_select.h"
+#include "gdbsupport/gdb_select.h"
 #include "top.h"
 #include "target.h"
 #include "guile-internal.h"
diff --git a/gdb/inflow.c b/gdb/inflow.c
index e5e595e..1b8e819 100644
--- a/gdb/inflow.c
+++ b/gdb/inflow.c
@@ -27,7 +27,7 @@
 #include "observable.h"
 #include <signal.h>
 #include <fcntl.h>
-#include "gdb_select.h"
+#include "gdbsupport/gdb_select.h"
 
 #include "inflow.h"
 #include "gdbcmd.h"
diff --git a/gdb/infrun.c b/gdb/infrun.c
index 8ff34c3..88105e0 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -64,7 +64,7 @@
 #include "arch-utils.h"
 #include "gdbsupport/scope-exit.h"
 #include "gdbsupport/forward-scope-exit.h"
-#include "gdb_select.h"
+#include "gdbsupport/gdb_select.h"
 #include <unordered_map>
 
 /* Prototypes for local functions */
diff --git a/gdb/mingw-hdep.c b/gdb/mingw-hdep.c
index cc42549..016cf2d 100644
--- a/gdb/mingw-hdep.c
+++ b/gdb/mingw-hdep.c
@@ -22,7 +22,7 @@
 #include "serial.h"
 #include "event-loop.h"
 
-#include "gdb_select.h"
+#include "gdbsupport/gdb_select.h"
 
 #include <windows.h>
 
diff --git a/gdb/posix-hdep.c b/gdb/posix-hdep.c
index cca7241..e5754cd 100644
--- a/gdb/posix-hdep.c
+++ b/gdb/posix-hdep.c
@@ -20,7 +20,7 @@
 #include "defs.h"
 #include "event-loop.h"
 
-#include "gdb_select.h"
+#include "gdbsupport/gdb_select.h"
 
 /* Wrapper for select.  Nothing special needed on POSIX platforms.  */
 
diff --git a/gdb/ser-base.c b/gdb/ser-base.c
index 89d9a69..8231ec5 100644
--- a/gdb/ser-base.c
+++ b/gdb/ser-base.c
@@ -22,7 +22,7 @@
 #include "ser-base.h"
 #include "event-loop.h"
 
-#include "gdb_select.h"
+#include "gdbsupport/gdb_select.h"
 #include "gdbsupport/gdb_sys_time.h"
 #ifdef USE_WIN32API
 #include <winsock2.h>
diff --git a/gdb/ser-tcp.c b/gdb/ser-tcp.c
index c558174..1c6d5a3 100644
--- a/gdb/ser-tcp.c
+++ b/gdb/ser-tcp.c
@@ -58,7 +58,7 @@
 #endif
 
 #include <signal.h>
-#include "gdb_select.h"
+#include "gdbsupport/gdb_select.h"
 #include <algorithm>
 
 #ifndef HAVE_SOCKLEN_T
diff --git a/gdb/ser-unix.c b/gdb/ser-unix.c
index 8000e35..9a13acd 100644
--- a/gdb/ser-unix.c
+++ b/gdb/ser-unix.c
@@ -28,7 +28,7 @@
 #include <sys/socket.h>
 #include "gdbsupport/gdb_sys_time.h"
 
-#include "gdb_select.h"
+#include "gdbsupport/gdb_select.h"
 #include "gdbcmd.h"
 #include "gdbsupport/filestuff.h"
 #include <termios.h>
diff --git a/gdb/top.c b/gdb/top.c
index e243248..010aa6f 100644
--- a/gdb/top.c
+++ b/gdb/top.c
@@ -51,7 +51,7 @@
 #include "filenames.h"
 #include "frame.h"
 #include "gdbsupport/buffer.h"
-#include "gdb_select.h"
+#include "gdbsupport/gdb_select.h"
 #include "gdbsupport/scope-exit.h"
 #include "gdbarch.h"
 #include "gdbsupport/pathstuff.h"
diff --git a/gdb/ui-file.c b/gdb/ui-file.c
index f3adbd0..a7b63a4 100644
--- a/gdb/ui-file.c
+++ b/gdb/ui-file.c
@@ -22,7 +22,7 @@
 #include "defs.h"
 #include "ui-file.h"
 #include "gdb_obstack.h"
-#include "gdb_select.h"
+#include "gdbsupport/gdb_select.h"
 #include "gdbsupport/filestuff.h"
 #include "cli/cli-style.h"
 
diff --git a/gdbsupport/ChangeLog b/gdbsupport/ChangeLog
index 0d0ea87..880a6ae 100644
--- a/gdbsupport/ChangeLog
+++ b/gdbsupport/ChangeLog
@@ -1,5 +1,9 @@
 2020-04-13  Tom Tromey  <tom@tromey.com>
 
+	* gdb_select.h: Move from ../gdb/.
+
+2020-04-13  Tom Tromey  <tom@tromey.com>
+
 	* config.in, configure: Rebuild.
 	* common.m4 (GDB_AC_COMMON): Check for poll.h, sys/poll.h,
 	sys/select.h, and poll.
diff --git a/gdb/gdb_select.h b/gdbsupport/gdb_select.h
index 69021ac..69021ac 100644
--- a/gdb/gdb_select.h
+++ b/gdbsupport/gdb_select.h