Set the below two environment variables in edksetup.bat:
set CLANG_HOST_BIN=n
set CLANG_BIN=C:\Program Files\LLVM\bin\
In Windows, set CLANG_HOST_BIN=n to use nmake command
The CLANG_BIN is only be set if it is not defined.
Cc: Liming Gao <liming.gao@intel.com> Cc: Ray Ni <ray.ni@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Zhiguang Liu <zhiguang.liu@intel.com>