Fixed building for both iOS and tvOS on Xcode 8

Xcode-iOS/SDL/SDL.xcodeproj/project.pbxproj

@@ -1546,7 +1546,6 @@
 				PRODUCT_NAME = SDL2;
 				SDKROOT = appletvos;
 				SKIP_INSTALL = YES;
-				SUPPORTED_PLATFORMS = "appletvsimulator appletvos";
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 			};
@@ -1588,7 +1587,6 @@
 				PRODUCT_NAME = SDL2;
 				SDKROOT = appletvos;
 				SKIP_INSTALL = YES;
-				SUPPORTED_PLATFORMS = "appletvsimulator appletvos";
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				VALIDATE_PRODUCT = YES;
@@ -1607,7 +1605,6 @@
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				PRODUCT_NAME = SDL2;
 				SKIP_INSTALL = YES;
-				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos appletvsimulator appletvos";
 			};
 			name = Debug;
 		};
@@ -1623,7 +1620,6 @@
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				PRODUCT_NAME = SDL2;
 				SKIP_INSTALL = YES;
-				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos appletvsimulator appletvos";
 			};
 			name = Release;
 		};