Added "unknown" target to makefile, i.e. "Make unknown" will just remove config.mak and include/volatile.h
Added "unknown" target to makefile, i.e. "Make unknown" will just remove
config.mak and include/volatile.h


git-svn-id: 28d9401aa571d5108e51b194aae6f24ca5964c06@1093 8cc4aa7f-3514-0410-904f-f2cc9021211c

crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS,crystalspace/CS