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[cc1] Allow declaration of global array variables

It is desirable to declare global array variables with
an incomplete type, because in this case we are not defining
them and we can have later a definition.

--- a/cc1/decl.c

+++ b/cc1/decl.c

@@ -732,7 +732,7 @@

 	/* TODO: Add warning about ANSI limits */

 	if (!(tp->prop & TDEFINED)                &&

 	    sclass != EXTERN && sclass != TYPEDEF &&

-	    !(tp->op == ARY && yytoken == '=')) {

+	    (tp->op != ARY || yytoken != '=' && curctx != GLOBALCTX)) {

 		errorp("declared variable '%s' of incomplete type", name);

 	}