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)

# Super-H specific configuration file

# depends on EXPERIMENTAL

config ARCH_sh

    select ARCH_USE_MMU

    select ARCH_SUPPORTS_BOTH_ENDIAN

    select ARCH_DEFAULT_LE

    help

      The Super-H architecture, as defined by:

        http://www.renesas.com/fmwk.jsp?cnt=superh_family_landing.jsp&fp=/products/mpumcu/superh_family/

choice

    bool

    prompt "Variant"

config ARCH_SH_SH3

    bool

    prompt "sh3"

config ARCH_SH_SH4

    bool

    prompt "sh4"

config ARCH_SH_SH4A

    bool

    prompt "sh4a"

endchoice

config ARCH_SH_VARIANT

    string

    default "sh3"   if ARCH_SH_SH3

    default "sh4"   if ARCH_SH_SH4

    default "sh4a"  if ARCH_SH_SH4A