Ensure that the Android build on a windows host doesn't turn on WMO yet

The windows host builds with the old driver for now, so it doesn't yet support wmo

Author: hyp

CMakeLists.txt

@@ -42,7 +42,7 @@ if(NOT SWIFT_SYSTEM_NAME)
 endif()
 
 # Don't enable WMO on Windows due to linker failures
-if(NOT CMAKE_SYSTEM_NAME STREQUAL Windows)
+if(NOT CMAKE_HOST_SYSTEM_NAME STREQUAL Windows)
     # Enable whole module optimization for release builds & incremental for debug builds
     if(POLICY CMP0157)
         set(CMAKE_Swift_COMPILATION_MODE "$<IF:$<CONFIG:Release>,wholemodule,incremental>")