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.

 http://sources.redhat.com/cgi-bin/cvsweb.cgi/libc/sysdeps/unix/sysv/linux/sys/epoll.h.diff?r1=1.2&r2=1.3&cvsroot=glibc

 Include <stdint.h>.

 Fixes error

 /foo/gcc-3.3.2-glibc-2.3.2/powerpc-750-linux-gnu/sys-include/sys/epoll.h:60: error: parse error before "uint32_t"

 /foo/gcc-3.3.2-glibc-2.3.2/powerpc-750-linux-gnu/sys-include/sys/epoll.h:66: error: parse error before "uint32_t"

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

 RCS file: /cvs/glibc/libc/sysdeps/unix/sysv/linux/sys/epoll.h,v

 retrieving revision 1.2

 retrieving revision 1.3

 diff -u -r1.2 -r1.3

 --- libc/sysdeps/unix/sysv/linux/sys/epoll.h	2003/03/24 23:50:25	1.2

 +++ libc/sysdeps/unix/sysv/linux/sys/epoll.h	2003/06/13 19:49:50	1.3

 @@ -19,6 +19,7 @@

  #ifndef	_SYS_EPOLL_H

  #define	_SYS_EPOLL_H	1

 +#include <stdint.h>

  #include <sys/types.h>