Moving LIBMESH_DIR out of app Makefiles. It is now in build.mk instead.
Moving LIBMESH_DIR out of app Makefiles. It is now in build.mk instead.

Refs #1667.

r16158

idaholab/falcon,aeslaughter/falcon,idaholab/falcon,idaholab/falcon,aeslaughter/falcon,aeslaughter/falcon,idaholab/falcon