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.

 Index: libc/misc/time/time.c

 ===================================================================

 --- a/libc/misc/time/time.c	(revision 17534)

 +++ b/libc/misc/time/time.c	(revision 17647)

 @@ -158,7 +158,9 @@

  #endif

  #if defined (L_tzset) || defined (L_localtime_r) || defined(L_strftime) || \

 -    defined(L__time_mktime) || defined(L__time_mktime_tzi)

 +	 defined(L__time_mktime) || defined(L__time_mktime_tzi) || \

 +	 ((defined(L_strftime) || defined(L_strftime_l)) && \

 +	  defined(__UCLIBC_HAS_XLOCALE__))

  void _time_tzset (int);