Move tilegx, tilepro, and linux-generic from ports to libc.

I've moved the TILE-Gx and TILEPro ports to the main sysdeps hierarchy,
along with the linux-generic ports infrastructure.  Beyond the README
update, the move was just

    git mv ports/sysdeps/tile sysdeps/tile
    git mv ports/sysdeps/unix/sysv/linux/tile \
      sysdeps/unix/sysv/linux/tile
    git mv ports/sysdeps/unix/sysv/linux/generic \
      sysdeps/unix/sysv/linux/generic

I updated the relevant ChangeLogs along the lines of the ARM move
in commit c6bfe5c4d75 and tested the 64-bit tilegx build to confirm that
there were no changes in "objdump -dr" output in the shared objects.

1 files changed, 17 insertions, 0 deletions

diff --git a/sysdeps/tile/preconfigure b/sysdeps/tile/preconfigure
new file mode 100644
index 0000000..9dba5b1
--- /dev/null
+++ b/sysdeps/tile/preconfigure
@@ -0,0 +1,17 @@
+# This is a -*- sh -*-
+case "$machine" in
+    tilepro)
+	base_machine=tile machine=tile/tilepro ;;
+    tilegx)
+	base_machine=tile
+	if $CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | grep -q __LP64__; then
+	    machine=tile/tilegx/tilegx64
+	else
+	    machine=tile/tilegx/tilegx32
+	fi ;;
+esac
+case "$machine" in
+    tile*)
+	libc_commonpagesize=0x10000
+	libc_relro_required=yes ;;
+esac