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 error compiling with gcc-3.4.0:

os/os_oflags.c: In function `__db_oflags':

os/os_oflags.c:48: error: label at end of compound statement

make[2]: *** [/home/dank/wk/crosstool-0.28-rc4h/build/i686-unknown-linux-gnu/gcc-3.4.0-20040406-glibc-2.1.3/build-glibc/db2/os_oflags.os] Error 1

--- glibc-2.1.3/db2/os/os_oflags.c.old	Sun Apr 11 19:56:44 2004

+++ glibc-2.1.3/db2/os/os_oflags.c	Sun Apr 11 19:57:06 2004

@@ -44,7 +44,7 @@

 	case O_RDWR:

 		break;

 	default:		/* Bogus flags value from user.  */

-	  /* XXX no way to return error from here */

+		; /* XXX no way to return error from here */

 	}

 	if (oflags & O_CREAT)

 		dbflags |= DB_CREATE;