Workaround for _PATH_UTMP and _PATH_WTMP defines on musl libc

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/initctl.c

@@ -31,7 +31,6 @@
 #include <signal.h>
 #include <stdio.h>
 #include <time.h>
-#include <utmp.h>
 #include <arpa/inet.h>
 #include <lite/lite.h>
 
@@ -40,6 +39,7 @@
 #include "serv.h"
 #include "service.h"
 #include "util.h"
+#include "utmp-api.h"
 
 #define _PATH_COND _PATH_VARRUN "finit/cond/"