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[cc2-qbe] Add initial label for qbe

Qbe needs a label at the beginning of every basic block,
but when we don't have any code inside of a function we
does not generate any basic block. This code forces to
have at least one basic block composed of a label and
a jump statement.

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

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

@@ -317,7 +317,7 @@

 			break;

 		printf("%s%s %s.val", sep, size2asm(&p->type), symname(p));

 	}

-	puts(")\n{");

+	puts(")\n{\n@.start");

 	/* allocate stack space for parameters */

 	for (p = locals; p && (p->type.flags & PARF) != 0; p = p->next)

@@ -344,6 +344,8 @@

 		if (pc->op)

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

 	}

+	if (!prog)

+		puts("\t\tret");

 	puts("}");

 }