some Doxygen work

gdigi.h

@@ -20,6 +20,8 @@
 #include <glib.h>
 #include <glib-object.h>
 
+#ifndef DOXYGEN_SHOULD_SKIP_THIS
+
 enum {
   WAH_TYPE_CRY = 132,
   WAH_TYPE_FULLRANGE = 133,
@@ -539,6 +541,8 @@ enum {
 #define USB_AUDIO_PLAYBACK_MIX 12297
 #define USB_AUDIO_LEVEL 12307
 
+#endif /* DOXYGEN_SHOULD_SKIP_THIS */
+
 typedef enum {
     PRESETS_SYSTEM = 0,
     PRESETS_USER = 1,