install broken for treelang

[Jan Hubicka]

> 
> Mark,
> 
> it still fails for me:
> 
> /usr/bin/install -c -m 644 /abuild/aj/builds/gcc/misc/gcc/doc/fsf-funding.7 /opt/gcc/3.4-devel/man/man7/fsf-funding.7
> /usr/bin/install: cannot stat `/abuild/aj/builds/gcc/misc/gcc/doc/fsf-funding.7': No such file or directory
> make[1]: [install-man] Error 1 (ignored)

We are now having any make install failing, so SPEC testers are down :(
It would be nice to fix it soon.  Unless someone beats me, I will try to
do so tonight.
It does appear to be combination of two Makefile patches that came in at
once as regression tester didn't start dying after Mark's patch.

Honza