msys-lndir: Do not mention the X.org version lndir shipped with

This is too hard to find out and maintain for lndir updates. Also that
information has little value.

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
msys-lndir: Fix some typos in the usage help

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
msys-lndir: Reflect in the help that under MSYS hardlinks are created

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