* ycbcr: intel assembly fixes for old gcc-as in Tiger
minor changes in assembly that are friendly to the
older gcc-as in Tiger
* libvpx/moz.build: only use force_cpusubtype_all on PPC
this flag is not accepted by the intel assembler
* libvpx: compiler/assembler fixes for intel
use clang-3.4 as the primary compiler
use yasm for the assembly
* nss: use clang-3.4 as compiler on Intel
nss contains assembly that the old gas assembler can't manage
using clang-3.4 is the easiest fix for this, as it is
already needed elsewhere for libvpx
* Intel mozconfig: update
we need to force the old gas assembler to be used
for the majority of the build as the newer clang
one will fail
* client.mk: use original which
MacPorts has a newer version of the which command
that is supposed to be more like current 'which' versions,
but there is an error in it at present and the construct
used in TFF doesn't work correctly.
Until this is fixed, use the original /usr/bin/which (and that
one can in fact be used forever, of course).
