Replace unneeded manual dependency on header by adding it to SRCS.

Replace unneeded manual dependency on header by adding it to SRCS.

bsd.lib.mk and bsd.prog.mk already depend all objs on headers in SRCS if
there is not yet a depend file.  The headers in SRCS are never built or
installed.  After 'make depend' the header was already added as a proper
dependency on the objects where needed.

MFC after:	2 weeks
Sponsored by:	EMC / Isilon Storage Division