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/PR9552

 Works around gcc error

   "soinit.c:25: internal compiler error: in named_section_flags, at varasm.c:412"

 by fixing slightly incorrect code in glibc (the .eh_frame section used to

 be read-write, but it's now readonly according to discussion in

 http://sources.redhat.com/ml/binutils/2002-11/msg00592.html,

 so it's arguably incorrect to continue to put variables in there that aren't const).

 --- glibc-2.3.2/elf/soinit.c 2001-11-16 00:09:20.000000000 +0100

 +++ glibc-2.3.2/elf/soinit.c   2003-08-12 09:13:34.000000000 +0200

 @@ -25,7 +25,7 @@

  }

  #ifdef HAVE_DWARF2_UNWIND_INFO

 -static char __EH_FRAME_BEGIN__[]

 +const static char __EH_FRAME_BEGIN__[]

       __attribute__ ((section (".eh_frame")))

       = { };

  # ifdef HAVE_DWARF2_UNWIND_INFO_STATIC