fix: allow nintendoswitch target to compile

Signed-off-by: deadprogram <ron@hybridgroup.com>

src/runtime/runtime_nintendoswitch.go

@@ -84,6 +84,19 @@ func ticks() timeUnit {
 	return timeUnit(ticksToNanoseconds(timeUnit(getArmSystemTick())))
 }
 
+// timeOffset is how long the monotonic clock started after the Unix epoch. It
+// should be a positive integer under normal operation or zero when it has not
+// been set.
+var timeOffset int64
+
+//go:linkname now time.now
+func now() (sec int64, nsec int32, mono int64) {
+	mono = nanotime()
+	sec = (mono + timeOffset) / (1000 * 1000 * 1000)
+	nsec = int32((mono + timeOffset) - sec*(1000*1000*1000))
+	return
+}
+
 var stdoutBuffer = make([]byte, 120)
 var position = 0
 
@@ -98,6 +111,14 @@ func putchar(c byte) {
 	position++
 }
 
+func buffered() int {
+	return 0
+}
+
+func getchar() byte {
+	return 0
+}
+
 func abort() {
 	for {
 		exit(1)