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.
(transplanted from 1ba79f2126df8bd89120899a58f2d0bcc2e9c771)

This is a somewhat ordered TODO list:

Recuring tasks:

- update versions for every tools...

Non-recurring tasks:

- build our own versions for (minimum versions):

    m4          1.4.12

    autoconf    2.63

    automake    1.10.2

    libtool     2.2.4

- uClinux

- add newlib (for enhanced bare metal)

  - may need heavy tweaks and bends in gcc.sh

  - try to make it generic, will help for uClibc++

  - check whether it supports running under uClinux

- uClibc++

  - see newlib, above

- Cygwin target (needs newlib)

  - so we can complie for Windows/Cygwin

- mingw32 target

  - so we can compile for Windows/Win32

- mingw32 host

  - so we can run natively under Windows/Win32 (without requiring Cygwin)

- eglibc config file

  - see: http://sourceware.org/ml/crossgcc/2009-05/msg00022.html

- multilib