Update C++ language and library settings to match SDK projects.

.gitignore

 # Ignore CI build directory
 build/
+xcuserdata

googletest/xcode/gtest.xcodeproj/project.pbxproj

@@ -1067,6 +1067,9 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 40D4CDF10E30E07400294801 /* DebugProject.xcconfig */;
 			buildSettings = {
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				MACOSX_DEPLOYMENT_TARGET = 10.7;
 			};
 			name = Debug;
 		};
@@ -1074,6 +1077,9 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 40D4CDF40E30E07400294801 /* ReleaseProject.xcconfig */;
 			buildSettings = {
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				MACOSX_DEPLOYMENT_TARGET = 10.7;
 			};
 			name = Release;
 		};