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://lists.arm.linux.org.uk/pipermail/linux-arm-kernel/2002-September/011508.html

 # Fixes error

 # arm-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.5/build-glibc/libc.so.6: undefined reference to `size_of_encoded_value'

 # arm-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.5/build-glibc/libc.so.6: undefined reference to `read_encoded_value_with_base'

 # make[2]: *** [arm-unknown-linux-gnu/gcc-3.2.3-glibc-2.2.5/build-glibc/iconv/iconvconfig] Error 1

 --- glibc-2.2.5/sysdeps/unix/sysv/linux/configure.old	Sun Jan 20 19:27:33 2002

 +++ glibc-2.2.5/sysdeps/unix/sysv/linux/configure	Sun Jun  8 03:33:03 2003

 @@ -56,6 +56,10 @@

      arch_minimum_kernel=2.1.100

      libc_cv_gcc_unwind_find_fde=yes

      ;;

 +  arm*)

 +    libc_cv_gcc_unwind_find_fde=yes

 +    arch_minimum_kernel=2.0.10

 +    ;;

    i386*)

      libc_cv_gcc_unwind_find_fde=yes

      arch_minimum_kernel=2.0.10