This convinces the pre-receive hook to not consider all *.pnm files as
text files to reduce the patch sizes and avoids triggering whitespace
checks,
Contains a correction by Janne Grunau <janne-libav@jannau.net>
(cherry picked from commit 0f257e29c5)
Signed-off-by: Reinhard Tartler <siretart@tauware.de>
Reinhard Tartler