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

 iconvconfig.c: In function 'write_output':

 iconvconfig.c:973: error: invalid storage class for function 'name_insert'

 --- glibc-2.2.5/iconv/iconvconfig.c.old	2002-01-20 19:20:53.000000000 -0800

 +++ glibc-2.2.5/iconv/iconvconfig.c	2005-03-11 14:30:27.000000000 -0800

 @@ -969,7 +969,12 @@

    char tmpfname[sizeof (GCONV_MODULES_CACHE) + strlen (".XXXXXX")];

    /* Function to insert the names.  */

 -  static void name_insert (const void *nodep, VISIT value, int level)

 +#if __GNUC__ >= 4

 +  auto 

 +#else

 +  static 

 +#endif

 +  void name_insert (const void *nodep, VISIT value, int level)

      {

        struct name *name;

        unsigned int idx;