NMake Makefiles: Improve docs on building from GIT checkouts

Chun-wei Fan requested to merge msvc-git-build-doc into main


As pointed out in #970, we can make things clearer to people when building from a GIT checkout:

  • Mention that nmake /f generate-msvc.mak generate-nmake-files ... is necessary prior to running the actual build if building from a GIT checkout.
  • Onlyshow clearer diagnostic message when running nmake /f generate-msvc.mak generate-nmake-files without PYTHON=... specified.

With blessings, thank you!

Edited by Chun-wei Fan

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