configure: split has_or_abort in two: one to check, one to abort

Split the has_or_abort function in two:
- one that checks if the tool if found,
- one that calls the above check, and aborts if not found

The rational behind this is to be able to check for a tool
and if not found, fallback to using our bundled version,
should the need arise (and I get time).

Merge.

libc/glibc: don't use legacy snapshots

glibc snapshots have not been updated for about the
past 5 months. Consider them to be deprecated, now.

libc/glibc: remove dead code

The option to retrieve snapshots is already handled by
the generic 'specific date' and 'use latest' entries.
No need for a special case, as there's no code for it.

Merge.

debug/gdb: cleanup (remove) the static ncurses build

ncurses is built solely for the sake of building a native gdb.
The user should not rely on this library to build his/her userland,
but should rather build his/her own. So we remove it from the
sysroot after we successfully build the native gdb.

doc: update documentation, mostly eye-candy

sample: update the i686-nptl-linux-gnu sample

Update this sample, now it seems to correctly build again.

libc/eglibc: fix building for seemingly native toolchains

Build eglibc with -O2 as a fix/workaround to building
seemingly-native toolchains (see docs/overview.txt).

See:
- docs/overview.txt
- docs/known-issues.txt
- http://sourceware.org/ml/crossgcc/2009-10/msg00001.html

libc/glibc: fix building for seemingly native toolchains

Build glibc with -O2 as a fix/workaround to building
seemingly-native toolchains.

See:
- docs/overview.txt
- docs/known-issues.txt
- http://sourceware.org/ml/crossgcc/2009-09/msg00055.html

samples: upgrade some samples

Upgrading all samples is too much a hassle.
Stick with those few for now.

samples: remove arm-beagle-linux-gnueabi

Use the generic arm-cortex_a8-linux-gnueabi sample instead.

Merge.

scripts: update config.guess and config.sub

readme: document patch description

gcc: ecjx.cc -> ecjx.o should use host compiler, not cross compiler

gcc: forward port gcc-4.4.0 patchset to 4.4.1

kernel/linux: update versions.

Insert an empty line bwetween added new versions.

debug/ltrace: fix build with /exotic/ linux-host OS

For ARM EABI hosts (ct-ng's target), the tupple ends in 'gnueabi'
For uClibc-based toolchains, the tuple ends in '-uclibc.*'
Make ltrace recognise those tuples as being the same as 'linux-gnu'

Merge.

samples: correclty fix saving samples with a C library config file

samples: fix uClibc config file location

comp-libs/cloog: fix building

For CLooG/PPL 0.15.3, the directory name was simply cloog-ppl.
For any later versions, the driectory name does have the version, such as
cloog-ppl-0.15.4.

config: fix indentation for options marked EXPERIMENTAL or OBSOLETE

Change the 2-space separation into a 1-space separation, for the sake
of homogeneity.

scripts: add new version at top of choice

Add new versions at the top of the choice menu, not at the bottom.

config: re-order menu entries so that latest versions are at the top

It makes better sense to have latest versions at the top of the choice
entries.

Merge.

samples: update

comp-libs/mpc: add latest 0.7 version.