Apparently, some platforms don't have the index() function.

(closes issue #15639)
 Reported by: nmav


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@210064 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/strcompat.c

@@ -84,6 +84,13 @@ int unsetenv(const char *name)
 }
 #endif
 
+#ifndef HAVE_INDEX
+char *index(const char *haystack, int needle)
+{
+	return strchr(haystack, needle);
+}
+#endif
+
 #ifndef HAVE_STRCASESTR
 static char *upper(const char *orig, char *buf, int bufsize)
 {