Huge fixes to glibc build, so that we can build at least (and at last):
- use ports addon even when installing headers,
- use optimisation (-O) when installing headers, to avoid unnecessary warnings (thanks Robert P. J. DAY for pointing this out!),
- lowest kernel version to use is only X.Y.Z, not X.Y.Z.T,
- a bit of preparations for NPTL (RSN I hope),
- fix fixing the linker scripts (changing the backup file is kind of useless and stupid);

Shut uClibc finish step: there really is nothing to do;

Add a patch for glibc-2.3.6 weak aliases handling on some archs (ARM and ALPHA at least);

Did not catch the make errors: fixed the pattern matching in scripts/functions;

Introduce a new log level, ALL:
- send components' build messages there,
- DEBUG log level is destined only for crosstool-NG debug messages,
- migrate sub-actions to use appropriate log levels;

Update the armeb-unknown-linux-gnu sample:
- it builds!
- uses gcc-4.0.4 and glibc-2.3.6,
- updated to latest config options set.

 --- glibc-2.2.5/configure.old	2003-05-30 21:51:13.000000000 -0700

 +++ glibc-2.2.5/configure	2003-05-30 21:51:23.000000000 -0700

 @@ -1738,7 +1738,7 @@

    ac_cv_prog_cc_works=yes

    # If we can't run a trivial program, we are probably using a cross compiler.

    if (./conftest; exit) 2>/dev/null; then

 -    ac_cv_prog_cc_cross=no

 +    ac_cv_prog_cc_cross=yes

    else

      ac_cv_prog_cc_cross=yes

    fi