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.

 diff -urN glibc-2.2.5-orig/sysdeps/unix/sysv/linux/i386/sysdep.h glibc-2.2.5/sysdeps/unix/sysv/linux/i386/sysdep.h

 --- glibc-2.2.5-orig/sysdeps/unix/sysv/linux/i386/sysdep.h	2001-07-06 06:56:16.000000000 +0200

 +++ glibc-2.2.5/sysdeps/unix/sysv/linux/i386/sysdep.h	2004-09-03 12:35:44.000000000 +0200

 @@ -36,6 +36,16 @@

  #undef L

  #define L(name)	.L##name

 +/* This is a kludge to make syscalls.list find these under the names

 + *    pread and pwrite, since some kernel headers define those names

 + *       and some define the *64 names for the same system calls.  */

 +#if !defined __NR_pread && defined __NR_pread64

 +# define __NR_pread __NR_pread64

 +#endif

 +#if !defined __NR_pwrite && defined __NR_pwrite64

 +# define __NR_pwrite __NR_pwrite64

 +#endif

 +

  #ifdef __ASSEMBLER__

  /* Linux uses a negative return value to indicate syscall errors,