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[cc2-qbe] Do not append ':' to block labels

Qbe does not require ':' at the end of labels, and in
fact, it is an error.

--- a/cc2/arch/qbe/code.c

+++ b/cc2/arch/qbe/code.c

@@ -345,7 +345,7 @@

 	/* emit assembler instructions */

 	for (pc = prog; pc; pc = pc->next) {

 		if (pc->label)

-			printf("%s:\n", symname(pc->label));

+			printf("%s\n", symname(pc->label));

 		if (pc->op)

 			(*optbl[pc->op].fun)();

 	}