[vdr] change make install to be really useful

[Udo Richter]

Matthias Schwarzott wrote:
> makefile-destdir.diff:
> It add variable DESTDIR to makefile to install under $(DESTDIR) instead of /

I would prefer something like DESTDIR=/usr/local that can be redirected 
to /usr or /tmp/newpackage/usr or similar, just as many configure 
scripts do it. On the downside, this wouldn't work for 
$(DESTDIR)$(VIDEODIR).

Cheers,

Udo