Re: [msysGit] Re: Add MinGW header files to build git with MSVC

This was a patch which originated from Frank Li's original series. While we
might have been able to simply use the MSVC one, I'm sure Frank had a reason
for overriding it with the small content which you see in this patch. We'll
have to ask Frank about that. We can always remove it now, if the MSVC
version works ok and doesn't introduce any compiler errors/warnings.

At beginning, I don't want to copy all msys header files to
vcbuilc\include and copy only necessary header file and data
structure.
Many structures have been defined at MSVC standard file.  So I use
simple utimer.h and unistd.h and dirent.h.

Best regards
Frank Li