Enable precompiled headers in XCode

gameplay/gameplay.xcodeproj/project.pbxproj

@@ -2262,6 +2262,8 @@
 		4234D99114686BB6003031B3 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				GCC_PRECOMPILE_PREFIX_HEADER = YES;
+				GCC_PREFIX_HEADER = src/gameplay.h;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = macosx;
 				SUPPORTED_PLATFORMS = "iphonesimulator macosx iphoneos";
@@ -2272,6 +2274,8 @@
 		4234D99214686BB6003031B3 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				GCC_PRECOMPILE_PREFIX_HEADER = YES;
+				GCC_PREFIX_HEADER = src/gameplay.h;
 				SDKROOT = macosx;
 				SUPPORTED_PLATFORMS = "iphonesimulator macosx iphoneos";
 				VALID_ARCHS = "armv7 armv7s arm64 i386 x86_64";
@@ -2291,8 +2295,6 @@
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_ENABLE_OBJC_EXCEPTIONS = YES;
 				GCC_OPTIMIZATION_LEVEL = 0;
-				GCC_PRECOMPILE_PREFIX_HEADER = NO;
-				GCC_PREFIX_HEADER = "";
 				GCC_PREPROCESSOR_DEFINITIONS = (
 					"DEBUG=1",
 					"$(inherited)",
@@ -2332,8 +2334,6 @@
 				FRAMEWORK_SEARCH_PATHS = "$(inherited)";
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_ENABLE_OBJC_EXCEPTIONS = YES;
-				GCC_PRECOMPILE_PREFIX_HEADER = NO;
-				GCC_PREFIX_HEADER = "";
 				GCC_VERSION = com.apple.compilers.llvm.clang.1_0;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = NO;
 				GCC_WARN_ABOUT_MISSING_PROTOTYPES = NO;
@@ -2369,8 +2369,6 @@
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_ENABLE_OBJC_EXCEPTIONS = YES;
 				GCC_OPTIMIZATION_LEVEL = 0;
-				GCC_PRECOMPILE_PREFIX_HEADER = NO;
-				GCC_PREFIX_HEADER = "";
 				GCC_PREPROCESSOR_DEFINITIONS = "DEBUG=1";
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_VERSION = com.apple.compilers.llvm.clang.1_0;
@@ -2415,8 +2413,6 @@
 				FRAMEWORK_SEARCH_PATHS = "$(inherited)";
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_ENABLE_OBJC_EXCEPTIONS = YES;
-				GCC_PRECOMPILE_PREFIX_HEADER = NO;
-				GCC_PREFIX_HEADER = "";
 				GCC_PREPROCESSOR_DEFINITIONS = "";
 				GCC_VERSION = com.apple.compilers.llvm.clang.1_0;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = NO;