Allow using nanosleep in hl_usleep

src/sleep.c

@@ -60,8 +60,14 @@ int hl_usleep(rig_useconds_t usec)
         retval = usleep(1000000);
         usec -= 1000000;
     }
-
+#ifdef HAVE_NANOSLEEP
+    struct timespec t, tleft;
+    t.tv_sec = usec/1e6;
+    t.tv_nsec = (usec - (t.tv_sec*1e6)) * 1e3;
+    return nanosleep(&t, &tleft);
+#else
     return usleep(usec);
+#endif
 }
 
 #ifdef HAVE_NANOSLEEP