gdb: Remove use of deprecated_interactive_hook

The deprecated_interactive_hook is not used within GDB.  It is used in
gdbtk, however this patch removes that use:

  https://sourceware.org/ml/insight/2019-q2/msg00001.html

So I think there is no longer a reason to keep this hook around.

This patch removes it.  There should be no user visible changes after
this commit.

gdb/ChangeLog:

	* defs.h (deprecated_interactive_hook): Delete declaration.
	* interps.c (clear_interpreter_hooks): Remove use of
	deprecated_interactive_hook.
	* top.c (deprecated_interactive_hook): Delete definition.
	* utils.c (maybe_quit): Remove use of deprecated_interactive_hook.

1 files changed, 0 insertions, 1 deletions

diff --git a/gdb/defs.h b/gdb/defs.h
index e95d0d4..3d878c8 100644
--- a/gdb/defs.h
+++ b/gdb/defs.h
@@ -600,7 +600,6 @@ extern int (*deprecated_query_hook) (const char *, va_list)
      ATTRIBUTE_FPTR_PRINTF(1,0);
 extern void (*deprecated_warning_hook) (const char *, va_list)
      ATTRIBUTE_FPTR_PRINTF(1,0);
-extern void (*deprecated_interactive_hook) (void);
 extern void (*deprecated_readline_begin_hook) (const char *, ...)
      ATTRIBUTE_FPTR_PRINTF_1;
 extern char *(*deprecated_readline_hook) (const char *);