rename "configs" to "optlib"

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
recompile if Makefile is changed

The result of compilation depends the value of ALL_CPPFLAGS variable
of Makefile.in. In other words *.o should be compiled again when
Makefile is changed. This pacth adds Makefile to prerequisites of
$(OBJECTS) target.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>