File mode problem on Github edk2-BaseTools-win32

[Evan Lloyd <Evan.Lloyd@arm.com>]

There is a minor, but annoying, problem with file modes on the Github edk2-BaseTools-win32 repository.
Git maintains a limited internal record of the Unix style file modes.
edk2-BaseTools-win32 currently causes Git to set the file's modes to 660.
So, after a checkout or pull of master, the builds fail because the files do not have Windows' "Read & Execute" permission.
This is simple to fix, but one has to remember (or, ofttimes, get reminded) to do it every time there is an update.

Liming,
Because this is purely a permission problem in the Git repository, and .exe files are not amenable to patching, I have raised a pull request on  https://github.com/tianocore/edk2-BaseTools-win32/pulls
This is only a minor thing, but I would deem it a great favour were you to accept the pull request.
It has me tearing my hair out, and I have little enough to begin with.  :-{

Regards,
Evan

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