Remove weak symbol redefinitions when building on linux with gcc.

third_party/libxml/src/threads.c

 /**
  * threads.c: set of generic threading related routines
  *
  * See Copyright for the status of this software.
  *
  * Gary Pennington <Gary.Pennington@uk.sun.com>
  * daniel@veillard.com
  */
 
 #define IN_LIBXML
@@ skipping 29 matching lines @@
 
 #if defined(SOLARIS)
 #include <note.h>
 #endif
 
 /* #define DEBUG_THREADS */
 
 #ifdef HAVE_PTHREAD_H
 
 static int libxml_is_threaded = -1;
-#ifdef __GNUC__
-#ifdef linux
-#if (__GNUC__ == 3 && __GNUC_MINOR__ >= 3) || (__GNUC__ > 3)
-extern int pthread_once (pthread_once_t *__once_control,
-                         void (*__init_routine) (void))
-           __attribute((weak));
-extern void *pthread_getspecific (pthread_key_t __key)
-           __attribute((weak));
-extern int pthread_setspecific (pthread_key_t __key,
-                                __const void *__pointer)
-           __attribute((weak));
-extern int pthread_key_create (pthread_key_t *__key,
-                               void (*__destr_function) (void *))
-           __attribute((weak));
-extern int pthread_key_delete (pthread_key_t __key)
-           __attribute((weak));
-extern int pthread_mutex_init ()
-           __attribute((weak));
-extern int pthread_mutex_destroy ()
-           __attribute((weak));
-extern int pthread_mutex_lock ()
-           __attribute((weak));
-extern int pthread_mutex_unlock ()
-           __attribute((weak));
-extern int pthread_cond_init ()
-           __attribute((weak));
-extern int pthread_cond_destroy ()
-           __attribute((weak));
-extern int pthread_cond_wait ()
-           __attribute((weak));
-extern int pthread_equal ()
-           __attribute((weak));
-extern pthread_t pthread_self ()
-           __attribute((weak));
-extern int pthread_key_create ()
-           __attribute((weak));
-extern int pthread_key_delete ()
-           __attribute((weak));
-extern int pthread_cond_signal ()
-           __attribute((weak));
-#endif
-#endif /* linux */
-#endif /* __GNUC__ */
+
 #endif /* HAVE_PTHREAD_H */
 
 /*
  * TODO: this module still uses malloc/free and not xmlMalloc/xmlFree
  *       to avoid some crazyness since xmlMalloc/xmlFree may actually
  *       be hosted on allocated blocks needing them for the allocation ...
  */
 
 /*
  * xmlMutex are a simple mutual exception locks
@@ skipping 920 matching lines @@
                     free(p);
                 }
             }
             break;
     }
     return TRUE;
 }
 #endif
 #define bottom_threads
 #include "elfgcchack.h"