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Align elements in stack to 2

Stack in z80 is a 2 byte stack, so char will use 2 bytes always,
or in other case we can have problems with the stack.

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -508,7 +508,11 @@

 	char sclass = *token;

 	if (sclass == 'A' || sclass == 'R') {

-		curfun->u.f.locals += sym->u.v.type.size;

+		uint8_t size = sym->u.v.type.size;

+		/* stack elements are 2 byte multiple */

+		if (size == 1)

+			++size;

+		curfun->u.f.locals += size;

 		sym->u.v.off = curfun->u.f.locals;

 	}

 }