Update Xcode project to support 64-bit builds, and clean up some old project cruft

platform/macosx/love.xcodeproj/project.pbxproj

@@ -1704,29 +1704,13 @@
 		C01FCF4B08A954540054247B /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ALWAYS_SEARCH_USER_PATHS = NO;
 				COPY_PHASE_STRIP = NO;
-				FRAMEWORK_SEARCH_PATHS = (
-					"$(inherited)",
-					"\"$(SRCROOT)\"",
-				);
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_MODEL_TUNING = G5;
 				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = love_Prefix.pch;
-				HEADER_SEARCH_PATHS = (
-					/Library/Frameworks/Lua.framework/Headers,
-					/Library/Frameworks/FreeType.framework/Headers,
-					/Library/Frameworks/SDL.framework/Headers,
-					../../src,
-					../../src/modules,
-				);
 				INSTALL_PATH = "$(HOME)/Applications";
-				LIBRARY_SEARCH_PATHS = (
-					"$(inherited)",
-					"\"$(SRCROOT)\"",
-				);
 				PRODUCT_NAME = love;
 			};
 			name = Debug;
@@ -1734,30 +1718,20 @@
 		C01FCF4C08A954540054247B /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ALWAYS_SEARCH_USER_PATHS = NO;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
-				FRAMEWORK_SEARCH_PATHS = (
-					"$(inherited)",
-					"\"$(SRCROOT)\"",
-				);
 				GCC_MODEL_TUNING = G5;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = love_Prefix.pch;
 				INSTALL_PATH = "$(HOME)/Applications";
-				LIBRARY_SEARCH_PATHS = (
-					"$(inherited)",
-					"\"$(SRCROOT)\"",
-				);
-				ONLY_ACTIVE_ARCH = NO;
 				PRODUCT_NAME = love;
-				SDKROOT = "";
 			};
 			name = Release;
 		};
 		C01FCF4F08A954540054247B /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ARCHS = "$(ARCHS_STANDARD_32_BIT)";
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				ARCHS = "$(ARCHS_STANDARD_32_64_BIT)";
 				FRAMEWORK_SEARCH_PATHS = "";
 				GCC_C_LANGUAGE_STANDARD = c99;
 				GCC_INCREASE_PRECOMPILED_HEADER_SHARING = YES;
@@ -1797,7 +1771,6 @@
 				OTHER_LDFLAGS = "";
 				PRODUCT_NAME = love;
 				SDKROOT = macosx;
-				VALID_ARCHS = "i386 ppc";
 				WARNING_CFLAGS = (
 					"-W",
 					"-Wall",
@@ -1808,7 +1781,8 @@
 		C01FCF5008A954540054247B /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ARCHS = "$(ARCHS_STANDARD_32_BIT)";
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				ARCHS = "$(ARCHS_STANDARD_32_64_BIT)";
 				DEPLOYMENT_POSTPROCESSING = NO;
 				FRAMEWORK_SEARCH_PATHS = "";
 				GCC_C_LANGUAGE_STANDARD = c99;
@@ -1853,7 +1827,6 @@
 				SCAN_ALL_SOURCE_FILES_FOR_INCLUDES = YES;
 				SDKROOT = macosx;
 				USER_HEADER_SEARCH_PATHS = "";
-				VALID_ARCHS = "i386 ppc";
 				WARNING_CFLAGS = (
 					"-W",
 					"-Wall",