scripts/populate: add -m option, to merge source and dest

Merge the source rootfs into the (pre-existing) destination rootfs,
and populate the result accordingly.

scripts/populate: add option to use an alternate sysroot

Add a new command line option, "-r", which allows the user to specify
an alternate sysroot location to copy libraries from. This is useful
when using the toolchain in combination with a separate root filesystem,
or when working with multiple different root filesystems.

Signed-off-by: Nate Case <ncase@xes-inc.com>

binutils/sstrip: fix when sstrip is disabled

cc/gcc: fix building for powerpc for the 4.4.x series

Reported by: Thomas Petazzoni
http://sourceware.org/ml/crossgcc/2010-03/msg00057.html

Discussions:
http://lists.uclibc.org/pipermail/uclibc/2010-March/043697.html
http://lists.uclibc.org/pipermail/buildroot/2010-March/032790.html
http://ibot.rikers.org/%23uclibc/20100316.html.gz
(search for "copysignl", by kos_tom, blindvt and y_morin)

binutils/sstrip: get rid of ELFkickers

ELFkickers are looong dead and unmaintained, and the sstrip
from buildroot is working fine *and* is maintained.

binutils/sstrip: depends on ELF

No point building sstrip is the target is not ELF.

tools: move sstrip to the binary utilities menu

sstrip is now alone in its 'tools' menu, and we will probably never gain
any other 'tool'. Besides, sstrip is just strip, but a little bit more
agressive, so it deserves going to the 'binary utilities' menu.

debug/gdb: gdb>=7.0 can use MPC, enable for cross-gdb

debug/gdb: add handling of 7_0_or_later

We'll need to differentiate gdb 7.0 or later, from gdb prior to 7.0

debug/gdb: add option to use GMP and MPFR

GMP and MPFR are optional for gdb, so offer a config option.

debug/gdb: can't build a static native gdb if using GMP/MPFR

It is currently impossible to reliably build static GMP/MPFR libs,
so we can't build a static native gdb using them, obviously.

debug/gdb: split menuconfig for easier maintenance

cc/gcc: fix use of companion libraries

complibs: hide prompts

scripts: fix dumping the config for companion libraries for target

Companion libraries can be disable for the host, but still used for
the target (eg. binutils or gdb). Dump the version also in this case.

scripts: fix dumping config

libelf has been moved to being a companion library, now.

config: hide entries when in backend mode

This implies hidding entries for:
- binutils libraries
- dmalloc
- duma
- native gdb
- ltrace
- strace
- sstrip

kconfig: silence a warning about undefined env variable

When using an environment variable to set a config entry,
don'twarn if it is not defined. Update doc accordingly.

config: prepare for build-system backend

When acting as a backend for a build-system, we should not build
any application that runs on the target, that is:
- no native gdb
- no companion libraries
- no binutils libraries
- no debug tools (save for gdbserver)
- ...

Here, we simply prepare the (hidden) config option that will detect
that we are acting as a back-end.

Update doc accordingly.

samples: fix samples

kernel/linux: add latest versions 2.6.32.10 and 2.6.33.1

debug/gdb: fix building the native tic

The native 'tic' will _always_ be run on the build
machine, so no need to handle canadian/native/...

Reported by: Trevor Woerner
http://sourceware.org/ml/crossgcc/2010-03/msg00055.html
(transplanted from 26e89d367ea11660fd3a0bf0bcad8763e4fa21cf)

debug/gdb: fix building the native tic

The native 'tic' will _always_ be run on the build
machine, so no need to handle canadian/native/...

Reported by: Trevor Woerner
http://sourceware.org/ml/crossgcc/2010-03/msg00055.html

scripts: fix the release script to use the C locale

Force use of the C locale to ensure messages are recognised by the script.

1.6: update version to 1.6.1+hg

Tagging release 1.6.1

1.6: update version to 1.6.1

scripts: enhance and fix the release script

samples: update and fix

scripts: fix completion to show samples
(transplanted from bf1f86bdd79fd20126d20795f425f603a5544952)