Properly dump dropped foreign table cols in binary-upgrade mode.

In binary upgrade mode, we need to recreate and then drop dropped
columns so that all the columns get the right attribute number. This is
true for foreign tables as well as for native tables. For foreign
tables we have been getting the first part right but not the second,
leading to bogus columns in the upgraded database. Fix this all the way
back to 9.1, where foreign tables were introduced.

src/bin/pg_dump/pg_dump.c

@@ -13126,7 +13126,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 		 * attislocal correctly, plus fix up any inherited CHECK constraints.
 		 * Analogously, we set up typed tables using ALTER TABLE / OF here.
 		 */
-		if (binary_upgrade && tbinfo->relkind == RELKIND_RELATION)
+		if (binary_upgrade && (tbinfo->relkind == RELKIND_RELATION || 
+							   tbinfo->relkind == RELKIND_FOREIGN_TABLE) )
 		{
 			for (j = 0; j < tbinfo->numatts; j++)
 			{
@@ -13144,13 +13145,19 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 					appendStringLiteralAH(q, fmtId(tbinfo->dobj.name), fout);
 					appendPQExpBuffer(q, "::pg_catalog.regclass;\n");
 
-					appendPQExpBuffer(q, "ALTER TABLE ONLY %s ",
+					if (tbinfo->relkind == RELKIND_RELATION)
-									  fmtId(tbinfo->dobj.name));
+						appendPQExpBuffer(q, "ALTER TABLE ONLY %s ",
+										  fmtId(tbinfo->dobj.name));
+					else
+						appendPQExpBuffer(q, "ALTER FOREIGN TABLE %s ",
+										  fmtId(tbinfo->dobj.name));
+						
 					appendPQExpBuffer(q, "DROP COLUMN %s;\n",
 									  fmtId(tbinfo->attnames[j]));
 				}
 				else if (!tbinfo->attislocal[j])
 				{
+					Assert(tbinfo->relkind != RELKIND_FOREIGN_TABLE);
 					appendPQExpBuffer(q, "\n-- For binary upgrade, recreate inherited column.\n");
 					appendPQExpBuffer(q, "UPDATE pg_catalog.pg_attribute\n"
 									  "SET attislocal = false\n"