[patch] Fix dynamic linker spec for FreeBSD powerpc64

[Andreas Tobler <andreast-list at fgznet dot ch>]

Hi all,

The attached patch fixes a problem you get if you build dynamic binaries 
for a 32-bit powerpc target on a 64-bit powerpc host.

At the time I did this port I didn't fully understand all the scenarios 
you might run into.

The issue is this, on all FreeBSD archs the interpreter is ld-elf.so.1.
On powerpc64 we have also an ld-elf32.so.1 for 32-bit binaries. In case 
we run a 32-bit binary on a 64-bit host the RTLD reroutes the call to 
this ld-elf32.so.1.

Up to now this rerouting didn't happen since gcc used the ld-elf32.so.1 
instead. The binary runs fine on the 64-bit host since the RTLD finds a 
ld-elf32.so.1.

But now when I take this binary to a 32-bit host I can't run it since 
the RTLD does not find the ld-elf32.so.1.

The patch fixes this and simplifies the LINK_OS_FREEBSD_SPEC_DEF for 
FreeBSD powerpc64.

If there are no major objections I'm going to apply this patch to trunk, 
gcc-5 and gcc-49 branch in the next days. It is FreeBSD powerpc64 only 
and it is a bug.

Thanks,
Andreas

2015-12-22  Andreas Tobler  <andreast@gcc.gnu.org>

	* config/rs6000/freebsd64.h: Delete FREEBSD_DYNAMIC_LINKER32/64
	defines. Use FBSD_DYNAMIC_LINKER instead.
	Rename and simplify LINK_OS_FREEBSD_SPEC_DEF32/64 to
	LINK_OS_FREEBSD_SPEC_DEF.

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