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.

Give preference to target-optimised functions over glibc's ones,

which in turn ahave precedence over generic ones.

--- uClibc.orig/libc/Makefile	2005-07-20 08:10:44.000000000 +0200

+++ uclibc/libc/Makefile	2005-07-28 13:33:40.000000000 +0200

@@ -59,7 +59,7 @@

 	$(AR) dN 2 $(LIBNAME) $$objs && \

 	$(AR) dN 2 $(LIBNAME) $$objs

 	@for objfile in obj.signal \

-	                obj.string.generic obj.string.$(TARGET_ARCH) obj.string \

+	                obj.string obj.string.generic obj.string.$(TARGET_ARCH) \

 	                obj.sysdeps.common obj.sysdeps.$(TARGET_ARCH) ; do \

 		if [ -e $$objfile ] ; then \

 			echo $(AR) $(ARFLAGS) $(LIBNAME) $$objfile ; \