Fix clang -Wstrict-prototypes warnings

This trivial diff gets rid of noisy warnings such as
```
./src/common/ignore.c:274:13: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  274 | ignore_load ()
      |             ^
      |              void
```
when building with modern clang. This is cosmetic since these functions
are actually prototyped in a header, so if the header is in scope it's
not possible to call them with an arbitrary number of arguments.

src/common/ignore.c

@@ -271,7 +271,7 @@ ignore_read_next_entry (char *my_cfg, struct ignore *ignore)
 }
 
 void
-ignore_load ()
+ignore_load (void)
 {
 	struct ignore *ignore;
 	struct stat st;
@@ -302,7 +302,7 @@ ignore_load ()
 }
 
 void
-ignore_save ()
+ignore_save (void)
 {
 	char buf[1024];
 	int fh;

src/common/notify.c

@@ -662,7 +662,7 @@ notify_isnotify (struct session *sess, char *name)
 }
 
 void
-notify_cleanup ()
+notify_cleanup (void)
 {
 	GSList *list = notify_list;
 	GSList *nslist, *srvlist;

src/common/text.c

@@ -1808,7 +1808,7 @@ pevent_check_all_loaded (void)
 }
 
 void
-load_text_events ()
+load_text_events (void)
 {
 	memset (&pntevts_text, 0, sizeof (char *) * (NUM_XP));
 	memset (&pntevts, 0, sizeof (char *) * (NUM_XP));
@@ -2488,7 +2488,7 @@ sound_load_event (char *evt, char *file)
 }
 
 void
-sound_load ()
+sound_load (void)
 {
 	int fd;
 	char buf[512];
@@ -2521,7 +2521,7 @@ sound_load ()
 }
 
 void
-sound_save ()
+sound_save (void)
 {
 	int fd, i;
 	char buf[512];