cmake: set CC flag on macOS only for depends build

Author: hayzamjs

CMakeLists.txt

@@ -69,7 +69,9 @@ endif()
 if(APPLE)
     	if(DEFINED scala_BINARY_DIR AND NOT "${scala_BINARY_DIR}" STREQUAL "")
 		if(DEFINED CMAKE_OSX_SYSROOT)
-			set(CROSS_CC "CC=clang --target=${CLANG_TARGET} --sysroot=${CMAKE_OSX_SYSROOT}")
+  			if(DEPENDS)
+				set(CROSS_CC "CC=clang --target=${CLANG_TARGET} --sysroot=${CMAKE_OSX_SYSROOT}")
+    			endif()
 		endif()
 	endif()
 endif()