[PATCH] Fix target dependent headerfile search path

[Franz Sirl]

Hi,

on my PPC I usually configure with ppc-redhat-linux which results in a 
$target_alias of ppc-redhat-linux and a $target of powerpc-redhat-linux-gnu.

Now, the headers get installed into /usr/$(target_alias)/..., but the search 
path is set to /usr/$(target)/...

The attached patch fixes that, OK to commit?

Franz.


	* Makefile.in (gcc_gxx_target_include_dir): Use $(target_alias).