toward #1070: fix for make -j8 in drake/ dir.
toward #1070: fix for make -j8 in drake/ dir.

This patch follow the pattern established in the superbuild Makefile.

sheim/drake,billhoffman/drake,sheim/drake,billhoffman/drake,sheim/drake,billhoffman/drake,billhoffman/drake,billhoffman/drake,sheim/drake,billhoffman/drake,sheim/drake,sheim/drake,billhoffman/drake,sheim/drake,sheim/drake,billhoffman/drake