control/core.c: Use C99's __func__ unstead of gcc's __FUNCTION__ as dionoea...

control/core.c: Use C99's __func__ unstead of gcc's __FUNCTION__ as dionoea requested in libvlc_exception_not_handled(). Make that function static.

src/control/core.c

@@ -63,9 +63,10 @@ libvlc_exception_get_message( const libvlc_exception_t *p_exception )
     return NULL;
 }
 
-void libvlc_exception_not_handled( const char *psz )
+static void libvlc_exception_not_handled( const char *psz )
 {
-    fprintf( stderr, "*** LibVLC Exception not handled: %s\nSet a breakpoint in '%s' to debug.\n", psz, __FUNCTION__ );
+    fprintf( stderr, "*** LibVLC Exception not handled: %s\nSet a breakpoint in '%s' to debug.\n",
+             psz, __func__ );
 }
 
 void libvlc_exception_raise( libvlc_exception_t *p_exception,