appveyor.yml: Ensure we use the appveyor `git`
When we install mingw we end up with another `git.exe` binary
which can't successfully run `git-testament` for some reason.
Prepend the git path so that we ensure we can even in mingw
circumstances.
@@ -57,6 +57,8 @@ install:
# add mingw to PATH if necessary
- if defined MINGW_DIR set PATH=C:\msys64\%MINGW_DIR%\bin;C:\msys64\usr\bin;%PATH%
+ # And if mingw, re-put appveyor's git in place
+ - if defined MINGW_DIR set PATH=C:\Program Files\Git\cmd;%PATH%
# let's see what we got
- where gcc rustc cargo
