signal.c: do not disable handlers to dump core

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59054 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

signal.c

@@ -1390,7 +1390,6 @@ sig_list(void)
 	static const char failed[] = "failed to install "signame" handler"; \
 	if (!(cond)) break; \
 	if (reserved_signal_p(signum)) rb_bug(failed); \
-	ruby_enable_coredump = 1; \
 	perror(failed); \
     } while (0)
 static int