minor patch to ld/emultempl/elf32.em

[matthew green]

   : This patch only activates the Linux processing when targeting Linux (and
   : makes room for simular processing when targeting FreeBSD).  I created ld
   : targeting i686-pc-linux-gnu and did `make check' and things looked OK,
   : along with a `make check' on FreeBSD 4.2.
   
   Why is this patch necessary ?  Ie what harm is there in checking
   ld.so.conf on non-Linux based systems ?


i'm not sure if this _is_ an issue, but other systems besides linux have
an /etc/ld.so.conf and they do not all have the same semantics.


.mrg.