Don't map Darwin to macOS

Author: Kasuromi

cmake/EarlyGlobals.cmake

@@ -41,7 +41,6 @@ elseif(CMAKE_SYSTEM_NAME MATCHES "^Darwin")
     set(CMAKE_SYSTEM_NAME "iOS")
     set(SYSTEM.iOS 1)
   elseif(PROCESSOR.X86 OR PROCESSOR.X86_64)
-    set(CMAKE_SYSTEM_NAME "macOS")
     set(SYSTEM.macOS 1)
   endif()
   set(SYSTEM.Darwin 1)