qitools.sh: add a to_native_path function
qitools.sh: add a to_native_path function

FIXME: please use this everywhere you read a path from outside!

dmerejkowsky/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,aldebaran/qibuild,aldebaran/qibuild,aldebaran/qibuild