Introduced a platform independent version of strchr, as the return value is c...

src/platform-macos.cc

Index: src/platform-macos.cc
===================================================================
--- src/platform-macos.cc	(revision 1325)
+++ src/platform-macos.cc	(working copy)
@@ -185,6 +185,11 @@
 }
 
 
+char* OS::StrChr(char* str, int c) {
+  return strchr(str, c);
+}
+
+
 void OS::StrNCpy(Vector<char> dest, const char* src, size_t n) {
   strncpy(dest.start(), src, n);
 }