sim: nrun: decode signal when crashing

This isn't entirely correct in that it assumes the signal numbering of
the target and host match, but seeing as we already make that assumption
in a few places, this patch doesn't make the situation any worse.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

sim/common/ChangeLog

@@ -1,3 +1,7 @@
+2012-03-18  Mike Frysinger  <vapier@gentoo.org>
+
+	* nrun.c (main): Display strsignal of sigrc.
+
 2012-01-06  Mike Frysinger  <vapier@gentoo.org>
 
 	* Makefile.in (abs_srcdir): Declare.

sim/common/nrun.c

@@ -202,7 +202,8 @@ main (int argc, char **argv)
     case sim_signalled:
     case sim_stopped:
       if (sigrc != 0)
-        fprintf (stderr, "program stopped with signal %d.\n", sigrc);
+	fprintf (stderr, "program stopped with signal %d (%s).\n", sigrc,
+		 strsignal (sigrc));
       break;
 
     case sim_exited: