macOS: only build for x64, for now

We don't support arm64 yet

platform/xcode/liblove.xcodeproj/project.pbxproj

@@ -5301,6 +5301,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				ARCHS = x86_64;
 				COMBINE_HIDPI_IMAGES = YES;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				DYLIB_COMPATIBILITY_VERSION = 9.0;
@@ -5344,6 +5345,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				ARCHS = x86_64;
 				COMBINE_HIDPI_IMAGES = YES;
 				DYLIB_COMPATIBILITY_VERSION = 9.0;
 				DYLIB_CURRENT_VERSION = 9.0;
@@ -5386,6 +5388,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				ARCHS = x86_64;
 				COMBINE_HIDPI_IMAGES = YES;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				DYLIB_COMPATIBILITY_VERSION = 9.0;

platform/xcode/love.xcodeproj/project.pbxproj

@@ -436,6 +436,7 @@
 		C01FCF4B08A954540054247B /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				ARCHS = x86_64;
 				ASSETCATALOG_COMPILER_APPICON_NAME = "OS X AppIcon";
 				CODE_SIGN_ENTITLEMENTS = love.entitlements;
 				CODE_SIGN_IDENTITY = "";
@@ -469,6 +470,7 @@
 		C01FCF4C08A954540054247B /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				ARCHS = x86_64;
 				ASSETCATALOG_COMPILER_APPICON_NAME = "OS X AppIcon";
 				CODE_SIGN_ENTITLEMENTS = love.entitlements;
 				CODE_SIGN_IDENTITY = "";
@@ -891,6 +893,7 @@
 		FA5326C718971A0900F7BBF4 /* Distribution */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				ARCHS = x86_64;
 				ASSETCATALOG_COMPILER_APPICON_NAME = "OS X AppIcon";
 				CODE_SIGN_ENTITLEMENTS = love.entitlements;
 				CODE_SIGN_IDENTITY = "";