tools/mccibootloader_image build find hard to fetch header files.

[mukeshbharath]

DESCRIPTION:
Clang is used for building the mccibooatloader_image under git-bash in windows. It uses the C library headers (stdio, stdlib, et) available under the UCRT of the Visual Studio SDKs.
When more than one SDK version is available, it finds it difficult to fetch the required headers for the build.

FIX:
This can be neglected by either uninstalling the unused SDK versions maintaining the active SDK alone.