Fix gyptest-xcode-gcc.py when using Xcode 5.0.2

test/mac/xcode-gcc/test.gyp

Index: test/mac/xcode-gcc/test.gyp
diff --git a/test/mac/xcode-gcc/test.gyp b/test/mac/xcode-gcc/test.gyp
index c0fcb504a170dd8c90a6b0c7f609177e0e47618d..1ca8b215d8763f0b8ebe0acf2ccdf4350fc0a89c 100644
--- a/test/mac/xcode-gcc/test.gyp
+++ b/test/mac/xcode-gcc/test.gyp
@@ -2,11 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 {
-  'make_global_settings': [
-    ['CC', '/usr/bin/gcc'],
-    ['CXX', '/usr/bin/g++'],
-  ],
-
   'target_defaults': {
     'xcode_settings': {
       'GCC_TREAT_WARNINGS_AS_ERRORS': 'YES',