Bump Windows PortableGit to 1.9.5

Bump git to 1.8.5.6 for Mac binaries

add checksums for git

(cherry picked from commit 2841decc3bebd784b73685930b16f6a9845ee3f7)

Conflicts:
	deps/Versions.make

use kernel.org url for git

this tarball comes with configure so doesn't require autoconf

(cherry picked from commit a3d95db08e1ad11b38147a2054f8fec59937b142)