Remove the libvlc global lock

We have enough static locks in libvlc, I think: the
configuration R/W lock, the module bank mutex, the system-specific
initialization mutex, the message subscription R/W lock, the sets
of mutexes for initializations of specific libraries, the LibVLC
thread variable mutex, the configuration file mutex, the PRNG mutex,
the object pipe mutex, the object name mutex, the dialog provider
mutex, the interface module registration mutex, the OSD mutex, the
VLM mutex, the HTTP hosts mutex and the OSD mutex...

src/libvlc.c

@@ -98,7 +98,6 @@
 /*****************************************************************************
  * The evil global variables. We handle them with care, don't worry.
  *****************************************************************************/
-static unsigned          i_instances = 0;
 
 #ifndef WIN32
 static bool b_daemon = false;
@@ -173,7 +172,6 @@ static void PauseConsole  ( void );
 #endif
 static int  ConsoleWidth  ( void );
 
-static vlc_mutex_t global_lock = VLC_STATIC_MUTEX;
 extern const char psz_vlc_changeset[];
 
 /**
@@ -188,19 +186,9 @@ libvlc_int_t * libvlc_InternalCreate( void )
 
     /* Now that the thread system is initialized, we don't have much, but
      * at least we have variables */
-    vlc_mutex_lock( &global_lock );
-    if( i_instances == 0 )
-    {
-        /* The module bank will be initialized later */
-    }
-
     /* Allocate a libvlc instance object */
     p_libvlc = vlc_custom_create( (vlc_object_t *)NULL, sizeof (*priv),
                                   "libvlc" );
-    if( p_libvlc != NULL )
-        i_instances++;
-    vlc_mutex_unlock( &global_lock );
-
     if( p_libvlc == NULL )
         return NULL;
 
@@ -969,15 +957,7 @@ void libvlc_InternalDestroy( libvlc_int_t *p_libvlc )
 {
     libvlc_priv_t *priv = libvlc_priv( p_libvlc );
 
-    vlc_mutex_lock( &global_lock );
-    i_instances--;
-
-    if( i_instances == 0 )
-    {
-        /* System specific cleaning code */
     system_End( );
-    }
-    vlc_mutex_unlock( &global_lock );
 
     /* Destroy mutexes */
     vlc_ExitDestroy( &priv->exit );