[PATCH] Build fix for lib/Support/Path.cpp

[dmo2118 at gmail.com]

Was running a MacPorts build of llvm-3.3 on Mac OS X 10.4. It didn't 
work: apparently _CS_DARWIN_USER_TEMP_DIR and _CS_DARWIN_USER_CACHE_DIR 
aren't on that version of OS X.

Attached is a fix.

Dave Odell
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Index: lib/Support/Path.cpp
===================================================================
--- lib/Support/Path.cpp	(revision 201028)
+++ lib/Support/Path.cpp	(working copy)
@@ -507,7 +507,7 @@
 void system_temp_directory(bool erasedOnReboot, SmallVectorImpl<char> &result) {
   result.clear();
 
-#ifdef __APPLE__
+#if defined _CS_DARWIN_USER_TEMP_DIR && defined _CS_DARWIN_USER_CACHE_DIR
   // On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR.
   int ConfName = erasedOnReboot? _CS_DARWIN_USER_TEMP_DIR
                                : _CS_DARWIN_USER_CACHE_DIR;