[arch-dev-public] gcc-4.8 toolchain

[Allan McRae]

I have this built and sitting waiting on the boost rebuild to be done
before it is uploaded (as I do not want to tie the boost rebuild to the
toolchain update).

Here are the changes:

gcc-4.8.0-1
 - major upstream update (http://gcc.gnu.org/gcc-4.8/changes.html)
 - It looks like Fedora Rawhide is already built with this so should be
   fairly smooth...\
 - ppl dependency is gone (and will be dropped from repos - or at least
   from [core])

linux-api-headers-3.8.4-1
 - update (from 3.7 series)

binutils-2.23.2-1
 - minor upstream update

glibc-2.17-4
 - plain rebuild

libtool-2.4.2-8
 - plain rebuild


If everyone could lend a hand in finishing the boost rebuild, the would
be much appreciated!

Allan