onnxruntime

try to find patch.exe in git default installation folder (#17106)

### Description
updates the build.bat file in root folder to try best efforts to locate
patch.exe.

patch.exe is needed to apply patches to some of the dependencies. for
example, #17104. However, patch.exe is not available on every windows
developer's search path, and if cannot find patch.exe, the build will
continue silently. ( as a result, patch is not applied and for patches
like #17104, this will cause a build break )

This change adds folder `C:\Program Files\Git\usr\bin` to the PATH,
which is the default git installation directory. This may resolve the
patch not found issue for most (hopefully) users.