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 drivers/char/char.o(.text+0x178a4): In function `$a':

 : undefined reference to `get_user'

 Part of ftp://ftp.arm.linux.org.uk/pub/armlinux/source/kernel-patches/v2.4/patch-2.4.26-vrs1.bz2

 diff -urN linux-2.4.26/drivers/char/wdt977.c linux-2.4.26-vrs1/drivers/char/wdt977.c

 --- linux-2.4.26/drivers/char/wdt977.c	2002-11-28 23:53:12.000000000 +0000

 +++ linux-2.4.26-vrs1/drivers/char/wdt977.c	2004-01-14 21:32:25.000000000 +0000

 @@ -27,6 +27,7 @@

  #include <asm/io.h>

  #include <asm/system.h>

  #include <asm/mach-types.h>

 +#include <asm/uaccess.h>

  #define WATCHDOG_MINOR	130