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)

 --- glibc-2.5/sysdeps/unix/sysv/linux/alpha/sigsuspend.S.orig	2006-10-22 22:17:01.000000000 +0200

 +++ glibc-2.5/sysdeps/unix/sysv/linux/alpha/sigsuspend.S	2006-10-22 22:18:05.000000000 +0200

 @@ -31,3 +31,21 @@

  libc_hidden_def (__sigsuspend)

  weak_alias (__sigsuspend, sigsuspend)

  strong_alias (__sigsuspend, __libc_sigsuspend)

 +

 +#ifndef NO_CANCELLATION

 +	.globl __sigsuspend_nocancel;

 +	.align 4;

 +	.type __sigsuspend_nocancel, @function;

 +	.usepv __sigsuspend_nocancel, std;

 +	cfi_startproc;

 +__LABEL(__sigsuspend_nocancel)

 +	ldgp    gp, 0(pv);

 +	PSEUDO_PROF;

 +	PSEUDO_PREPARE_ARGS

 +	lda     v0, SYS_ify(sigsuspend);

 +	call_pal PAL_callsys;

 +	bne     a3, SYSCALL_ERROR_LABEL;

 +	ret;

 +	cfi_endproc;

 +	.size __sigsuspend_nocancel, .-__sigsuspend_nocancel

 +#endif