Update to changed sourceforge API urls

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>
Merge pull request #243 from t-b/fix_mingw_w64_release_easy

Update to changed sourceforge API url
Prepare Release Notes for 1.9.4.msysgit.1

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>
Commit submodule in preparation of 1.9.4
download-stat: look for 1.9.4.msysgit.1 now

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>