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.

--- a/extra/scripts/unifdef.c

+++ b/extra/scripts/unifdef.c

@@ -206,7 +206,7 @@

 static void             error(const char *);

 static int              findsym(const char *);

 static void             flushline(bool);

-static Linetype         getline(void);

+static Linetype         get_line(void);

 static Linetype         ifeval(const char **);

 static void             ignoreoff(void);

 static void             ignoreon(void);

@@ -512,7 +512,7 @@

 	for (;;) {

 		linenum++;

-		lineval = getline();

+		lineval = get_line();

 		trans_table[ifstate[depth]][lineval]();

 		debug("process %s -> %s depth %d",

 		    linetype_name[lineval],

@@ -526,7 +526,7 @@

  * help from skipcomment().

  */

 static Linetype

-getline(void)

+get_line(void)

 {

 	const char *cp;

 	int cursym;