libc/uClibc: vampirise patches for 0.9.30.2 from builroot

Commit in upstream buildroot:
http://git.buildroot.org/buildroot/commit/?id=43ffd946ad569f3a1d0662de221cd4cb65bdc8e6
Everything on the 0_9_30 branch since the release (0.9.30.3 to be)

kernel/linux: add latest 2.6.32.9 and 2.6.33, remove old 2.6.32.x

complibs: remove headers after build

After the toolchain is built, we do no longer need the headers.
Reported-by: Enrico Weigelt <weigelt@metux.de>

binutils/binutils: add patch to default emulation for mips64

arch: add mips64

This adds initial mips64 config option and build script.

scripts: use more portable sed options

No need for extended regular expressions here.

scripts/samples: use the computed '$(sed)', not 'sed'

samples: fix this MIPS eglibc-based sample

Specify the SVN revision to use for the eglibc snapshot instead of HEAD,
as some patches made their way upstream in the meantime.

comp-libs: make libelf a companion library

When gcc-4.5 is out, it will require libelf. So better make it a
companion library now rather than postponing the ineluctable.

complibs: hide companion libraries for target entry

The companion libraries on the target are required only for internal use by
binutils and gdb. The user should not have to know about this, so hide the
option.