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.

 See http://gcc.gnu.org/PR3106

 Backported from gcc-3.0.x

 Fixes error

   .../binutils-2.11.2/libiberty/strerror.c:468: error: conflicting types for `sys_nerr'

   /usr/include/stdio.h:258: error: previous declaration of `sys_nerr'

   make[1]: *** [strerror.o] Error 1

   make: *** [all-libiberty] Error 2

 on Mac OS X.

 --- binutils-2.11.2/libiberty/strerror.c.old	2004-03-24 16:23:19.000000000 -0800

 +++ binutils-2.11.2/libiberty/strerror.c	2004-03-24 16:23:48.000000000 -0800

 @@ -13,6 +13,7 @@

     incompatible with our later declaration, perhaps by using const

     attributes.  So we hide the declaration in errno.h (if any) using a

     macro. */

 +#define sys_nerr sys_nerr__

  #define sys_errlist sys_errlist__

  #endif

 @@ -20,6 +21,7 @@

  #include <errno.h>

  #ifdef HAVE_SYS_ERRLIST

 +#undef sys_nerr

  #undef sys_errlist

  #endif