Add TestGypXcodeNinja to run tests against the xcode-ninja generator

test/hard_dependency/gyptest-exported-hard-dependency.py

Index: test/hard_dependency/gyptest-exported-hard-dependency.py
diff --git a/test/hard_dependency/gyptest-exported-hard-dependency.py b/test/hard_dependency/gyptest-exported-hard-dependency.py
index ba51528800419985d0aa57116a33fa532cf13da8..9663366c4bfcbbcf2ade4d000fc95add9f20e4a9 100755
--- a/test/hard_dependency/gyptest-exported-hard-dependency.py
+++ b/test/hard_dependency/gyptest-exported-hard-dependency.py
@@ -18,7 +18,9 @@ if test.format == 'dump_dependency_json':
   test.skip_test('Skipping test; dependency JSON does not adjust ' \
                  'static libraries.\n')
 
-test.run_gyp('hard_dependency.gyp', chdir='src')
+test.run_gyp('hard_dependency.gyp',
+             '-G', 'xcode_ninja_target_pattern=^c$',
+             chdir='src')
 
 chdir = 'relocate/src'
 test.relocate('src', chdir)