Fix kexi build with libpqxx 7

Signed-off-by: François Andriot <francois.andriot@free.fr>
(cherry picked from commit 73d1fecdcf)

kexi/migration/pqxx/pqxxmigrate.cpp

@@ -92,7 +92,11 @@ bool PqxxMigrate::drv_readTableSchema(
         for (uint i = 0; i < (uint)m_res->columns(); i++)
         {
             TQString fldName(m_res->column_name(i));
+#if PQXX_VERSION_MAJOR < 7
             KexiDB::Field::Type fldType = type(m_res->column_type(i), fldName);
+#else
+            KexiDB::Field::Type fldType = type(m_res->column_type(m_res->column_name(i)), fldName);
+#endif
             TQString fldID( KexiUtils::string2Identifier(fldName) );
             const pqxx::oid toid = tableOid(originalName);
             if (toid==0)
@@ -249,7 +253,9 @@ bool PqxxMigrate::drv_disconnect()
 {
     if (m_conn)
     {
+#if PQXX_VERSION_MAJOR < 7
         m_conn->disconnect();
+#endif
         delete m_conn;
 		m_conn = 0;
     }