Patch for readelf testsuite

[Hans-Peter Nilsson]

> Date: Sat, 31 Mar 2001 09:32:59 +1000 (EST)
> From: Alan Modra <alan@linuxcare.com.au>

> There
> are quite a few places where we want a "is this target elf?" test, and it
> would be nice to have just one place to update for odd targets.  Hmm,
> better yet, why not assemble a tiny file and look for the magic
> "ELF" string in the object.

It seems framework pieces for file-format tests like this can be
recycled from gcc/testsuite/lib/file-format.exp; bits from the
generic gas testsuite parts could be used for a generic assembly
file.

This would need to be different for linker tests; odd targets
could presumably assemble to ELF and link to another format.

brgds, H-P