.travis.yml: Exclude Windows machine for develop branch
.travis.yml: Exclude Windows machine for develop branch

Currently, Windows build is broken on the develop branch.  Remove it
from testing for the branch for now.  We'll re-enable it after we fix
it.

This is part of #212.

Signed-off-by: Yasushi SHOJI <afa9ca3be149447780c2f7b524d61ed3d3db63f9@spacecubics.com>

libcsp/libcsp,libcsp/libcsp