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.

 Give preference to target-optimised functions over glibc's ones,

 which in turn ahave precedence over generic ones.

 --- uClibc.orig/libc/Makefile	2005-07-20 08:10:44.000000000 +0200

 +++ uclibc/libc/Makefile	2005-07-28 13:33:40.000000000 +0200

 @@ -59,7 +59,7 @@

  	$(AR) dN 2 $(LIBNAME) $$objs && \

  	$(AR) dN 2 $(LIBNAME) $$objs

  	@for objfile in obj.signal \

 -	                obj.string.generic obj.string.$(TARGET_ARCH) obj.string \

 +	                obj.string obj.string.generic obj.string.$(TARGET_ARCH) \

  	                obj.sysdeps.common obj.sysdeps.$(TARGET_ARCH) ; do \

  		if [ -e $$objfile ] ; then \

  			echo $(AR) $(ARFLAGS) $(LIBNAME) $$objfile ; \