src/Makefile has targets that are files. But there is no
dependency listed for them, so whenever the file exists,
it seems make won't update anymore.
I've added in parallel other targets, and declared them
as PHONY ones. This seems to force rebuilding, at the
expense of re-entering each folder. diff to CVS
provided. Better solution possible.
I'm not sure if parts of ffdshow.ax have the same
problem. It has an obvious one already: updating a
header (like the uclibc++ ones) doesn't force a rebuild.
More work is needed on the .depend files.