msys-gzip: Add missing binary mode patch from upstream

1.6-1 is not able to compress and decompress data.
Perfectly seen also in the git test t5000 45/46.

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>
Merge pull request #18 from t-b/msys-gzip-fix-binary-mode

msys-gzip: Add missing binary mode patch from upstream which makes it usable again