Remove gdb workaround from readline/xfree.c

There is a gdb-local patch to deal with interrupts during completion.
The original thread adding this patch is here:

https://sourceware.org/ml/gdb-patches/2011-06/msg00147.html

I believe readline now implements the approach suggested by
Chet Ramey:

https://sourceware.org/ml/gdb-patches/2011-06/msg00493.html

So, I believe this patch can be removed.

readline/ChangeLog.gdb
2018-10-07  Tom Tromey  <tom@tromey.com>

	* Makefile.in (xfree.o): Don't depend on readline.h.
	* xfree.c (xfree): Remove gdb workaround.
	* xmalloc.h (xfree): Remove #define.

readline/ChangeLog.gdb

@@ -1,5 +1,11 @@
 2019-08-12  Tom Tromey  <tom@tromey.com>
 
+	* Makefile.in (xfree.o): Don't depend on readline.h.
+	* xfree.c (xfree): Remove gdb workaround.
+	* xmalloc.h (xfree): Remove #define.
+
+2018-08-12  Tom Tromey  <tom@tromey.com>
+
 	* emacs_keymap.c: Remove gdb workaround.
 
 2018-08-12  Tom Tromey  <tom@tromey.com>

readline/Makefile.in

@@ -437,7 +437,7 @@ vi_mode.o: rldefs.h ${BUILD_DIR}/config.h rlconf.h
 vi_mode.o: readline.h keymaps.h rltypedefs.h chardefs.h tilde.h
 vi_mode.o: history.h ansi_stdlib.h rlstdc.h
 xfree.o: ${BUILD_DIR}/config.h
-xfree.o: ansi_stdlib.h readline.h
+xfree.o: ansi_stdlib.h
 xmalloc.o: ${BUILD_DIR}/config.h
 xmalloc.o: ansi_stdlib.h
 

readline/xfree.c

@@ -31,10 +31,7 @@
 #  include "ansi_stdlib.h"
 #endif /* HAVE_STDLIB_H */
 
-#include <stdio.h>
-
 #include "xmalloc.h"
-#include "readline.h"
 
 /* **************************************************************** */
 /*								    */
@@ -48,10 +45,6 @@ void
 xfree (string)
      PTR_T string;
 {
-  /* Leak a bit.  */
-  if (RL_ISSTATE(RL_STATE_SIGHANDLER))
-    return;
-
   if (string)
     free (string);
 }

readline/xmalloc.h

@@ -38,9 +38,6 @@
 
 #endif /* !PTR_T */
 
-/* xmalloc and xrealloc should be also protected from RL_STATE_SIGHANDLER.  */
-#define xfree xfree_readline
-
 extern PTR_T xmalloc PARAMS((size_t));
 extern PTR_T xrealloc PARAMS((void *, size_t));
 extern void xfree PARAMS((void *));