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.

 Fixes

 checking version of powerpc-405-linux-gnu-gcc ... 4.0.0, bad

 checking for gnumake... no

 checking for gmake... no

 checking for make... make

 checking version of make... 3.80, ok

 configure: error:

 *** These critical programs are missing or too old:gcc 

 --- glibc-2.2.5/configure.old	2005-03-10 00:23:46.374213600 -0800

 +++ glibc-2.2.5/configure	2005-03-10 00:25:13.313996744 -0800

 @@ -1476,7 +1476,7 @@

    ac_prog_version=`$CC -v 2>&1 | sed -n 's/^.*version \([egcygnustpi-]*[0-9.]*\).*$/\1/p'`

    case $ac_prog_version in

      '') ac_prog_version="v. ?.??, bad"; ac_verc_fail=yes;;

 -    *gcc-2.9[5-9].*|*2.8.[1-9]*|*2.9|*2.9.[0-9]*|2.9[5-9]*|3.[0-9]*|cygnus-2.9[1-9]*|gcc-2.9[5-9]|gcc-2.1[0-9][0-9]|sgicc-*)

 +    *gcc-2.9[5-9].*|*2.8.[1-9]*|*2.9|*2.9.[0-9]*|2.9[5-9]*|3.[0-9]*|4.0*|cygnus-2.9[1-9]*|gcc-2.9[5-9]|gcc-2.1[0-9][0-9]|sgicc-*)

         ac_prog_version="$ac_prog_version, ok"; ac_verc_fail=no;;

      *) ac_prog_version="$ac_prog_version, bad"; ac_verc_fail=yes;;