merge-octopus: Work around environment issue on Windows
merge-octopus: Work around environment issue on Windows

For some reason, the environment variables get upper-cased when a
subprocess is launched on Windows. Cope with that.

[PT: fixed typo in the char range noted by junio]

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>
Signed-off-by: Pat Thoyts <fe43a83262eef1680511f524a1e74d43c633cffe@users.sourceforge.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git