Fixed issue #2859: Cannot clone URLs which contain non-ASCII chars with Git for Windows 2.10.1 and 2.10.2
"The LC_ALL variable is supposed to contain information about the locale to use. If unset, it used to default to "C" but apparently recent MSYS2 versions switched to using "ASCII" as default (which makes little sense, of course).
Let's just verify that LC_ALL is set, and fall back to setting LC_ALL=C if it is not." (https://github.com/git-for-windows/MINGW-packages/commit/
1bee65e5f691840fa7b203de8efbdf7d7bfc8aa5)
(fixes issue #2859)
Signed-off-by: Sven Strickroth <email@cs-ware.de>