sim: nrun: add local strsignal prototype

While libiberty provides a definition for this for systems that lack
the function (e.g. Windows), it doesn't provide a prototype.  So add
our own local copy in the one file that uses the func.

sim/rx/ChangeLog

@@ -1,3 +1,7 @@
+2021-05-01  Mike Frysinger  <vapier@gentoo.org>
+
+	* config.in, configure: Regenerate.
+
 2021-05-01  Mike Frysinger  <vapier@gentoo.org>
 
 	* load.c (rx_load): Cast size to long.

sim/rx/config.in

@@ -79,6 +79,9 @@
 /* Define to 1 if you have the <string.h> header file. */
 #undef HAVE_STRING_H
 
+/* Define to 1 if you have the `strsignal' function. */
+#undef HAVE_STRSIGNAL
+
 /* Define to 1 if `st_atime' is a member of `struct stat'. */
 #undef HAVE_STRUCT_STAT_ST_ATIME
 

sim/rx/configure

@@ -2303,6 +2303,7 @@ as_fn_append ac_func_list " mmap"
 as_fn_append ac_func_list " munmap"
 as_fn_append ac_func_list " posix_fallocate"
 as_fn_append ac_func_list " sigaction"
+as_fn_append ac_func_list " strsignal"
 as_fn_append ac_func_list " time"
 as_fn_append ac_func_list " truncate"
 # Check that the precious variables saved in the cache have kept the same
@@ -3942,6 +3943,8 @@ done
 
 
 
+
+
 
 
 
@@ -11184,7 +11187,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11187 "configure"
+#line 11190 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11290,7 +11293,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11293 "configure"
+#line 11296 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H