Set deployment target to 10.15

This resolves crashing for Intel Macs on macOS 13.x

Author: clobber

MAME.xcodeproj/project.pbxproj

@@ -348,7 +348,7 @@
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VALUE = NO;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				MACOSX_DEPLOYMENT_TARGET = 12.4;
+				MACOSX_DEPLOYMENT_TARGET = 10.15;
 				ONLY_ACTIVE_ARCH = YES;
 				PRECOMPS_INCLUDE_HEADERS_FROM_BUILT_PRODUCTS_DIR = NO;
 				SDKROOT = macosx;
@@ -403,7 +403,7 @@
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VALUE = NO;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				MACOSX_DEPLOYMENT_TARGET = 12.4;
+				MACOSX_DEPLOYMENT_TARGET = 10.15;
 				PRECOMPS_INCLUDE_HEADERS_FROM_BUILT_PRODUCTS_DIR = NO;
 				SDKROOT = macosx;
 			};