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.

 Fixes error

 ../sysdeps/unix/sysv/linux/errlist.c:41: error: weak declaration of '_old_sys_nerr' must precede definition

 ===================================================================

 --- glibc-2.2.2/sysdeps/unix/sysv/linux/errlist.c.old	2005-04-11 16:58:21.000000000 -0700

 +++ glibc-2.2.2/sysdeps/unix/sysv/linux/errlist.c	2005-04-11 16:58:10.000000000 -0700

 @@ -38,10 +38,9 @@

  const int __old_sys_nerr = OLD_ERRLIST_SIZE;

  strong_alias (__old_sys_nerr, _old_sys_nerr);

 -weak_alias (__old_sys_nerr, _old_sys_nerr)

  compat_symbol (libc, __old_sys_nerr, _sys_nerr, GLIBC_2_0);

  compat_symbol (libc, _old_sys_nerr, sys_nerr, GLIBC_2_0);

 -weak_alias (__old_sys_errlist, _old_sys_errlist);

 +strong_alias (__old_sys_errlist, _old_sys_errlist);

  compat_symbol (libc, __old_sys_errlist, _sys_errlist, GLIBC_2_0);

  compat_symbol (libc, _old_sys_errlist, sys_errlist, GLIBC_2_0);

  #endif