scripts/functions: add git wrapper

Add a git wrapper to retrieve components from their git tree.
Add a git wrapper to create a working copy (in our tarballs dir).
Recognise git trees when searching for local copies.

libc/glibc: get the version string from version.h

We can not rely on the user-provided version string (be it via the
choice, or manually entered), so fallback to reading version.h,
which is both reliable and always present.

scripts/functions: change handling of nochdir

- 'nochdir' must be the first option
- have systematic pushd/popd, even if nochdir

libc/glibc: move some options around

libc/glibc: get rid of the now obsolete CVS stuff

It's now been a while that glibc switched to git from cvs.
Get rid of cvs to download glibc; this will make for a good
cleanup before we add git support! :-)

libc/glibc: add 2.11 and 2.11.1

Merge.

kernel/linux: remove legacy check

Now, we only support building with Linux >=2.6.27.
Get rid of the code that depended on <2.6.18.

binutils/elf2flt: activate elf2flt build

The code has been lying around inactivated for some time.
Let's enable it at last, and see if any one needs it.

arch: add basic m68k support

Signed-off-by: Remy Bohmer <linux@bohmer.net>
[yann.morin.1998@anciens.enib.fr: use defaults for CT_TARGET_ARCH]
Signed-off-by: "Yann E. MORIN <yann.morin.1998@anciens.enib.fr>