[RFC] gcc linker path for armhf

[dann frazier]

At the ARM mini-summit there was a decision to change the linker path
encoded in binaries for the armhf port from:
   /lib/ld-linux.so.3
to:
   /lib/arm-linux-gnueabihf/ld-linux.so.3

Well, that's what I was told at least, room was too full when I got
there :)

I made an attempt at changing this simply by changing the static path,
but I got some feedback that pointed out this has problems on
(bi-|multi-) arch systems. So, I made a second pass by modifying the
linker spec to make this a runtime decision.

At this point I'd like to submit both patches as an RFC. I suspect the
static patch might be fine (and safest) for distributions like Debian
that don't yet enable bi-arch on armhf, but not for distros like
Ubuntu which do. The dynamic version should work in the bi-arch case,
but it also will change the default linker path for soft-float
binaries and I suspect we *don't* want to do that. Perhaps we need to
#ifdef that out somehow if we're building for a soft-float default
target?

Also, first time I've touched gcc spec files, so if anyone sees
anything that might be wrong, speakup - you're probably right :)
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