\o/ skins2 work on win32 \o/ <(°v°<)

Thanks a lot to ipkiss for providing the bisect builds and geal for his help.
(cherry picked from commit 88f22433)

include/vlc_interface.h

@@ -50,7 +50,7 @@ struct intf_thread_t
     VLC_COMMON_MEMBERS
 
     /* Thread properties and locks */
-#ifdef __APPLE__
+#if defined( __APPLE__ ) || defined( WIN32 )
     bool          b_should_run_on_first_thread;
 #endif
 

modules/gui/skins2/src/skin_main.cpp

@@ -157,6 +157,10 @@ static int Open( vlc_object_t *p_this )
     Dialogs::instance( p_intf );
     ThemeRepository::instance( p_intf );
 
+#ifdef WIN32
+    p_intf->b_should_run_on_first_thread = true;
+#endif
+
     return( VLC_SUCCESS );
 }
 

src/interface/interface.c

@@ -50,7 +50,7 @@
  * Local prototypes
  *****************************************************************************/
 static void* RunInterface( vlc_object_t *p_this );
-#ifdef __APPLE__
+#if defined( __APPLE__ ) || defined( WIN32 )
 static void * MonitorLibVLCDeath( vlc_object_t *p_this );
 #endif
 static int AddIntfCallback( vlc_object_t *, char const *,
@@ -96,7 +96,7 @@ intf_thread_t* __intf_Create( vlc_object_t *p_this, const char *psz_module )
     if( !p_intf )
         return NULL;
     p_intf->b_interaction = false;
-#ifdef __APPLE__
+#if defined( __APPLE__ ) || defined( WIN32 )
     p_intf->b_should_run_on_first_thread = false;
 #endif
 
@@ -139,7 +139,7 @@ intf_thread_t* __intf_Create( vlc_object_t *p_this, const char *psz_module )
  */
 int intf_RunThread( intf_thread_t *p_intf )
 {
-#ifdef __APPLE__
+#if defined( __APPLE__ ) || defined( WIN32 )
     /* Hack to get Mac OS X Cocoa runtime running
      * (it needs access to the main thread) */
     if( p_intf->b_should_run_on_first_thread )
@@ -261,7 +261,7 @@ static void* RunInterface( vlc_object_t *p_this )
     return NULL;
 }
 
-#ifdef __APPLE__
+#if defined( __APPLE__ ) || defined( WIN32 )
 /*****************************************************************************
  * MonitorLibVLCDeath: Used when b_should_run_on_first_thread is set.
  *****************************************************************************/