base: Do not use old-style definition

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8229>

subprojects/gst-plugins-base/gst-libs/gst/tag/gstxmptag.c

@@ -213,7 +213,7 @@ typedef GHashTable GstXmpSchema;
 #define gst_xmp_schema_lookup g_hash_table_lookup
 #define gst_xmp_schema_insert g_hash_table_insert
 static GstXmpSchema *
-gst_xmp_schema_new ()
+gst_xmp_schema_new (void)
 {
   return g_hash_table_new (g_direct_hash, g_direct_equal);
 }
@@ -1066,7 +1066,7 @@ _init_xmp_tag_map (gpointer user_data)
 }
 
 static void
-xmp_tags_initialize ()
+xmp_tags_initialize (void)
 {
   static GOnce my_once = G_ONCE_INIT;
   g_once (&my_once, (GThreadFunc) _init_xmp_tag_map, NULL);

subprojects/gst-plugins-base/gst-libs/gst/video/gstvideopool.c

@@ -280,7 +280,7 @@ no_memory:
  * Returns: (transfer full): a new #GstBufferPool to allocate video frames
  */
 GstBufferPool *
-gst_video_buffer_pool_new ()
+gst_video_buffer_pool_new (void)
 {
   GstVideoBufferPool *pool;
 

subprojects/gst-plugins-base/tests/check/elements/encodebin.c

@@ -29,7 +29,7 @@
 /* Helper functions to create profiles */
 
 static GstEncodingProfile *
-create_ogg_profile ()
+create_ogg_profile (void)
 {
   GstEncodingContainerProfile *prof;
   GstCaps *ogg;

subprojects/gst-plugins-base/tests/check/libs/rtp.c

@@ -2202,7 +2202,7 @@ create_feedback_buffer (gboolean with_padding)
 }
 
 static GstBuffer *
-create_remb_buffer ()
+create_remb_buffer (void)
 {
   guint8 remb_buffer[20] = {
     0x8f, 0xce, 0x00, 0x04,