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.

 --- orig/Makefile.in	2004-05-12 18:22:30.000000000 -0700

 +++ binutils-2.14.90.0.5/Makefile.in	2004-05-12 18:26:19.000000000 -0700

 @@ -24384,6 +24384,8 @@

  # Demangler depends on libiberty.

  configure-demangler: maybe-configure-libiberty

  all-demangler: maybe-all-libiberty

 +configure-build-demangler: maybe-configure-build-libiberty

 +all-build-demangler: maybe-all-build-libiberty

  # The new demangler, which is included in libiberty, is written in C++.

  # A working C++ compiler is required. For the target demangler, it may