Take "Git Bash.vbs" as of d6b6865 from msysgit.git

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
Git Bash: Fix the icon path

In contrast to msysgit, mingwGitDevEnv separates MinGW executables into a
"mingw" sub-directory.

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
Git Bash: Make the directory change mechanism work with start-in-root.sh

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
Git Bash: Support specifying the MSYSTEM (MINGW or MSYS)

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
Add msys-coreutils-ext package as recommended pkg

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>
update-perl-modules: Install the Win32::API package

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>