MTGDA (8.34) Add .hooks/post-checkout to correct dls-config/bin execute perms.

Note that this will only be copied into .git/hooks on deployment and
will only be run on a command line git checkout.

Checking out or switching branches from egit may still leave files
without group and other execute permissions.
Merge branch '8.34'

Conflicts:
	.hooks/post-checkout