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-4.2.1.orig/gcc/Makefile.in gcc-4.2.1/gcc/Makefile.in

--- gcc-4.2.1.orig/gcc/Makefile.in	2007-05-31 17:37:38.000000000 +0200

+++ gcc-4.2.1/gcc/Makefile.in	2007-08-03 20:36:14.000000000 +0200

@@ -2660,7 +2660,7 @@

 # FIXME: writing proper dependencies for this is a *LOT* of work.

 libbackend.o : $(OBJS-common:.o=.c) $(out_file) \

   insn-config.h insn-flags.h insn-codes.h insn-constants.h \

-  insn-attr.h  $(DATESTAMP) $(BASEVER) $(DEVPHASE)

+  insn-attr.h  $(DATESTAMP) $(BASEVER) $(DEVPHASE) gcov-iov.h

 	$(CC) $(ALL_CFLAGS) $(ALL_CPPFLAGS) \

 	  -DTARGET_NAME=\"$(target_noncanonical)\" \

 	  -DLOCALEDIR=\"$(localedir)\" \