Removes git-1.9.0-manifest-msys2.patch as it is already applied upstream
as fe90397604f9f9695b3fa0b8b11d9f93533b655f
Signed-off-by: Christopher Degawa <ccom@randomderp.com>
based on #1912, some old upstreaming process: https://github.com/gitgitgadget/git/pull/612/
In theory the script needs some way to detect a MSYS2 mingw env and special case some
things on top of that in combination with is_Cygwin.
Since we want to keep this diff small, keep it hacky.