make copy_string able to build on older compilers (bug #4714)

git-svn-id: https://origsvn.digium.com/svn/libpri/trunk@242 2fbb986a-6c06-0410-b554-c9c1f0a7f128

compiler.h

@@ -0,0 +1,19 @@
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * Compiler-specific macros and other items
+ *
+ * Copyright (C) 2005, Digium, Inc.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License
+ */
+
+#ifndef _ASTERISK_COMPILER_H
+#define _ASTERISK_COMPILER_H
+
+#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
+#define __builtin_expect(exp, c) (exp)
+#endif
+
+#endif /* _ASTERISK_COMPILER_H */

copy_string.c

@@ -26,6 +26,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 
+#include "compiler.h"
 #include "libpri.h"
 #include "pri_internal.h"