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)

 --- 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;