gdb: Drop use of obsolete AC_TYPE_SIGNAL

Since we're using sighandler_t, nothing else refers to RETSIGTYPE in
gdb.

(Actually, given gdb/remote.c has been assuming signal handlers return
void for a long time, we could have gotten get rid of this even
without gnulib's sighandler_t.)

gdb/ChangeLog:
2015-08-27  Pedro Alves  <palves@redhat.com>

	* configure.ac: Remove AC_TYPE_SIGNAL call.
	* configure, config.in: Regenerate.

1 files changed, 0 insertions, 33 deletions

diff --git a/gdb/configure b/gdb/configure
index e420c03640f..fd7ea1c98c6 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -11094,39 +11094,6 @@ fi
 # Checks for types.  #
 # ------------------ #
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking return type of signal handlers" >&5
-$as_echo_n "checking return type of signal handlers... " >&6; }
-if test "${ac_cv_type_signal+set}" = set; then :
-  $as_echo_n "(cached) " >&6
-else
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#include <sys/types.h>
-#include <signal.h>
-
-int
-main ()
-{
-return *(signal (0, 0)) (0) == 1;
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  ac_cv_type_signal=int
-else
-  ac_cv_type_signal=void
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_type_signal" >&5
-$as_echo "$ac_cv_type_signal" >&6; }
-
-cat >>confdefs.h <<_ACEOF
-#define RETSIGTYPE $ac_cv_type_signal
-_ACEOF
-
-
 ac_fn_c_check_type "$LINENO" "socklen_t" "ac_cv_type_socklen_t" "#include <sys/types.h>
 #include <sys/socket.h>