[PATCH] *scanf changes

[Jakub Jelinek <jakub at redhat dot com>]

Hi!

The following patch does 4 things that perhaps could be separated:
1) fixes a bug in the recently added _IO_acquire_lock_clear_flags2_fct
   function (mistakenly it was clearing _flags bit rather than _flags2)
2) allows m followed by l, so %mls, %ml[ etc. are valid (as POSIX mandates)
3) handles %mc, %mlc and %mC (which was added recently to the draft)
4) when compiling with -std=c99, or -D_XOPEN_SOURCE=600, without
   -D_GNU_SOURCE uses different entrypoints for *scanf routines, which
   don't special case %as, %aS and %a[.

4) is the 90% of this patch, unfortunately I'm not sure how to test
it in make check - attached is a scanf15.c test I was using with
make install_root=/tmp/foo/ install-headers installed headers,
but in the libc sources installed headers are mixed with non-installed
and so _GNU_SOURCE is a must.

Tested on x86_64-linux and ppc-linux (the latter to get the long double
compatibility stuff right).

	Jakub

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