Tell the loader where to find our libraries if we're being installed
someplace other than /usr .

Change-Id: I42cbe98bcfc0e8ba2aa08f651044db051d31205c
(cherry picked from commit 25d9695cb3536b672f4cd8bc280e2a3c816a0d8a)
Conflicts:
	packaging/rpm/SPECS/wireshark.spec.in
Reviewed-on: https://code.wireshark.org/review/5605
Reviewed-by: Jeff Morriss <jeff.morriss.ws@gmail.com>