add include guard to util.h

see RT #131110 for the bikeshedding on what name to use.

Based on an original patch by Jim Schneider

diff --git a/util.c b/util.c
index b324af4..2ca0291 100644 (file)
--- a/util.c
+++ b/util.c
@@ -21,6 +21,10 @@
  * dieing stuff, plus wrappers for malloc code.
  */
 
+#ifndef PERL_UTIL_H_
+#define PERL_UTIL_H_
+
+
 #include "EXTERN.h"
 #define PERL_IN_UTIL_C
 #include "perl.h"
@@ -6678,6 +6682,8 @@ Perl_dtrace_probe_phase(pTHX_ enum perl_phase phase)
 
 #endif
 
+#endif /* PERL_UTIL_H_ */
+
 /*
  * ex: set ts=8 sts=4 sw=4 et:
  */