chg: Minor cleanup

src/app/ifstate.cpp

 #include "if/if.hpp"
 
 int main() {
-    return ifmon_detect_changes();
+    return ifdev_monitor_changes();
 }

src/if/if.hpp

@@ -2,8 +2,4 @@
 
 #include <stdint.h>
 
-extern "C" {
-
-int ifmon_detect_changes ();
-
-}
+int ifdev_monitor_changes();

src/if/notify.cpp

@@ -144,7 +144,7 @@ int read_event (int sockint) {
     return ret;
 }
 
-int ifmon_detect_changes () {
+int ifdev_monitor_changes() {
     fd_set rfds, wfds;
 
     (void)wfds;