Fix PSQL column's metadata

Fixed libpq's PQfmod() interpretation inside QPSQLResult::record()

Task-number: QTBUG-12477
Change-Id: I0e4c94ca1b06fd6a8e5b5702235cdd6d9736f8bf
Reviewed-by: Andy Shaw <andy.shaw@digia.com>
Reviewed-by: Mark Brand <mabrand@mabrand.nl>
Allow building against static ICU libs also on Unix

For dynamic builds of ICU, libicudata is an implicit dependency. Anyhow,
it doesn't harm to explicitly link against it, either. So let's do
this everywhere ...

Task-number: QTBUG-38445
Change-Id: I420ba096e2ce5e1b8d81814ffb4aa7b300143b01
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>