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cc2/qbe: Use common symbols for tentative declarations

Common symbols allow multiple tentative definitions in
different symbols, which is a common extension of the C
language, specially in UNIX where C was born.

--- a/src/cmd/cc/cc2/target/qbe/code.c

+++ b/src/cmd/cc/cc2/target/qbe/code.c

@@ -287,10 +287,13 @@

 		return;

 	if (sym->kind == SGLOB)

 		fputs("export ", stdout);

-	printf("data %s = align %d {\n", symname(sym), tp->align);

-	if (sym->type.flags & INITF)

-		return;

-	printf("\tz\t%lu\n}\n", tp->size);

+

+	printf("data %s = %s align %d {\n",

+	       symname(sym),

+	       (tp->flags & INITF) ? "" : "common",

+	       tp->align);

+	if ((tp->flags & INITF) == 0)

+		printf("\tz\t%lu\n}\n", tp->size);

 }

 void