* doc.c: New variable Vbuild_files.

* doc.c: New variable Vbuild_files.
(Fsnarf_documentation): If Vbuild_files is nil, populate it with
file names from buildobh.lst.  Only attach docstrings from files
that are in Vbuild_files.
(syms_of_doc): Defvar Vbuild_files.

* Makefile.in (SOME_MACHINE_OBJECTS): Add fringe.o, image.o
and w32*.o.
(temacs${EXEEXT}): Generate buildobj.lst when temacs is linked.
(mostlyclean): rm buildobj.lst

* makefile.w32-in ($(TEMACS)): Generate buildobj.lst when temacs
is linked.