rb_bug_for_fatal_signal: exit with the right signal

`die()` calls `abort()` which always exit as it `SIGABRT`
was received.

This isn't very friendly with systems that automatically
collect crashes as the `%s` parameter will be changed.

error.c

@@ -1066,6 +1066,7 @@ rb_bug_for_fatal_signal(ruby_sighandler_t default_sighandler, int sig, const voi
 
     if (default_sighandler) default_sighandler(sig);
 
+    ruby_default_signal(sig);
     die();
 }