[PATCH] detecting the output file format

[Rafael Ávila de Espíndola]

I had a problem building a gcc with multilib support on a ppc64
(http://lists.debian.org/debian-powerpc/2004/12/msg00393.html). In that 
thread, and with some help from Alexandre Oliva and Janis Johnson, I figured 
out that the problem was that gcc/config/rs6000/t-linux64 and 
gcc/libjava/configure.host whore using the output of "gcc 
-print-multi-os-directory" to discover if the output file would be 32 or 64 
bits. I was installing the 64 bits library in /lib and the 32bits one 
in /lib32 so the test result was wrong.

Alexandre Oliva suggested compiling a .c file and running 'file' on the 
output. The attached patch implements his idea.

Rafael Ávila de Espíndola
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