libvlc: do not export libvlc_module_description_list_get but only the functions

restricted to the audio and video filters.

include/vlc/libvlc.h

@@ -409,8 +409,6 @@ typedef struct libvlc_module_description_t
     struct libvlc_module_description_t *p_next;
 } libvlc_module_description_t;
 
-libvlc_module_description_t *libvlc_module_description_list_get( libvlc_instance_t *p_instance, const char *capability );
-
 /**
  * Release a list of module descriptions.
  *

src/control/core.c

@@ -166,7 +166,8 @@ void libvlc_free( void *ptr )
     free( ptr );
 }
 
-libvlc_module_description_t *libvlc_module_description_list_get( libvlc_instance_t *p_instance, const char *capability )
+static libvlc_module_description_t *module_description_list_get(
+                libvlc_instance_t *p_instance, const char *capability )
 {
     VLC_UNUSED( p_instance );
     libvlc_module_description_t *p_list = NULL,
@@ -231,12 +232,12 @@ void libvlc_module_description_list_release( libvlc_module_description_t *p_list
 
 libvlc_module_description_t *libvlc_audio_filter_list_get( libvlc_instance_t *p_instance )
 {
-    return libvlc_module_description_list_get( p_instance, "audio filter" );
+    return module_description_list_get( p_instance, "audio filter" );
 }
 
 libvlc_module_description_t *libvlc_video_filter_list_get( libvlc_instance_t *p_instance )
 {
-    return libvlc_module_description_list_get( p_instance, "video filter2" );
+    return module_description_list_get( p_instance, "video filter2" );
 }
 
 int64_t libvlc_clock(void)