Remove localtime() uses, saving ~4-28KB from the final binary size.

arm9/source/emulator.c

@@ -255,7 +255,7 @@ void
 datetime_talk(Device *d, Uint8 b0, Uint8 w)
 {
 	time_t seconds = time(NULL);
-	struct tm *t = localtime(&seconds);
+	struct tm *t = gmtime(&seconds);
 	t->tm_year += 1900;
 	mempoke16(d->dat, 0x0, t->tm_year);
 	d->dat[0x2] = t->tm_mon;

arm9/source/stubs.c

@@ -0,0 +1,20 @@
+#include <nds.h>
+#include <time.h>
+
+// Stubbing out unused functionality, in order to optimize the uxnds filesize.
+
+// libfat source/filetime.c
+
+uint16_t _FAT_filetime_getTimeFromRTC (void) {
+	return 0;
+}
+
+uint16_t _FAT_filetime_getDateFromRTC (void) {
+	return 0;
+
+}
+time_t _FAT_filetime_to_time_t (uint16_t t, uint16_t d) {
+	return 0;
+}
+
+