Spurious make check failures due to automounter interaction

[Rainer Orth]

> while xgcc had no problem at all finding all previous source files.  The
> problem is that the check-gcc target in gcc/Makefile (and some others, too)
> use
> 
> 	srcdir=`cd ${srcdir}; pwd` ; export srcdir ; \
[...]
> Why is this cd/pwd construct used all, instead of just
> 
> 	export ${srcdir}

oops, of course I meant

	srcdir=${srcdir} ; export srcdir ;

With this change to gcc/Makefile.in (and an equivalent one to the site.exp
target there), I've just successfully finished a make check on an alpha.

	Rainer