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Fix MBC3+TIMER + handle lack of BATTERY

`TIMER & BATTERY` is 0, but even `|` would only be checking if
*either* is set; instead, imply BATTERY as soon as TIMER is given,
printing a warning if it was not given.

--- a/src/fix/main.c

+++ b/src/fix/main.c

@@ -494,7 +494,9 @@

 		case MBC3:

 			// Handle timer, which also requires battery

-			if (features & (TIMER & BATTERY)) {

+			if (features & TIMER) {

+				if (!(features & BATTERY))

+					fprintf(stderr, "warning: MBC3+TIMER implies BATTERY\n");

 				features &= ~(TIMER | BATTERY); // Reset those bits

 				mbc = MBC3_TIMER_BATTERY;

 				// RAM is handled below