TestMTCSimple: Make Makefile portable.

r374262 left out the Makefile changes needed to cross compile this test.

llvm-svn: 374451

Author: fredriss

lldb/packages/Python/lldbsuite/test/functionalities/mtc/simple/Makefile

@@ -1,4 +1,9 @@
 OBJC_SOURCES := main.m
-LD_EXTRAS := -lobjc -framework Foundation -framework AppKit
+ifeq ($(findstring MacOSX.platform,$(shell xcrun --show-sdk-path)),MacOSX.platform)
+UI_FRAMEWORK = AppKit
+else
+UI_FRAMEWORK = UIKit
+endif
+LD_EXTRAS = -lobjc -framework Foundation -framework $(UI_FRAMEWORK)
 
 include Makefile.rules