libc/uClibc: fix building on system with recent glibc

While trying to build a toolchain with ct-ng 1.5.0,
arm-unknown-linux-uclibcgnueabi target,
I get the following error:

[INFO ] Installing C library headers
[EXTRA] Copying sources to build dir
[EXTRA] Applying configuration
[EXTRA] Building headers
[EXTRA] Installing headers
[ERROR] extra/scripts/unifdef.c:209: error: conflicting types for 'getline'
[ERROR] make[2]: *** [extra/scripts/unifdef] Error 1
[ERROR] Build failed in step 'Installing C library headers'

The following patch solves the problem.
(It's a backport of this uClibc commit:
http://git.uclibc.org/uClibc/commit/?id=49e81cada73616864b9b31df0aeb6961c30f5a6e
)

[--SNIP from another mail--]
AFAIK this is a problem since glibc 2.10.

diff -durN gcc-4.4.0.orig/include/libiberty.h gcc-4.4.0/include/libiberty.h

--- gcc-4.4.0.orig/include/libiberty.h	2008-06-24 03:42:31.000000000 +0200

+++ gcc-4.4.0/include/libiberty.h	2009-05-27 21:38:24.000000000 +0200

@@ -595,8 +595,11 @@

 /* Like sprintf but provides a pointer to malloc'd storage, which must

    be freed by the caller.  */

+/* asprintf may be declared as a macro by glibc with __USE_FORTIFY_LEVEL.  */

+#ifndef asprintf

 extern int asprintf (char **, const char *, ...) ATTRIBUTE_PRINTF_2;

 #endif

+#endif

 #if !HAVE_DECL_VASPRINTF

 /* Like vsprintf but provides a pointer to malloc'd storage, which