Add some tools specific consistency tests

This upstreams parts of Qt Creator's tst_offset test to serve as
an early warning system by testing private implementation details
that are used in Qt Creator's data structure "pretty printing"
facility.

While the tested implementation details can be changed without
breaking binary or source compatibility, downstream tools like
Qt Creator depend on them.

If this test breaks, you are kindly asked to coordinate with the
downstream stakeholders to avoid tool breakage.

Change-Id: I1286efcec9bef105f80c2163a4f66f5c43f3a218
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>
Remove non-UNICODE code branches from ODBC plugin.

Task-number: QTBUG-39388
Change-Id: If22876454547098dd00e477c0593da7c4be0e803
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>
Fix MSVC warnings about integer conversions in ODBC driver.

qsql_odbc.cpp(360) : warning C4267: '=' : conversion from 'size_t' to 'int', possible loss of data
qsql_odbc.cpp(380) : warning C4267: 'initializing' : conversion from 'size_t' to 'int', possible loss of data
qsql_odbc.cpp(2052) : warning C4267: 'argument' : conversion from 'size_t' to 'SQLSMALLINT', possible loss of data
qsql_odbc.cpp(2070) : warning C4267: 'argument' : conversion from 'size_t' to 'SQLSMALLINT', possible loss of data
qsql_odbc.cpp(2096) : warning C4267: 'argument' : conversion from 'size_t' to 'SQLSMALLINT', possible loss of data

Task-number: QTBUG-39388
Change-Id: Ie97d9e968d5c7b013b0d364c64175aa9b329ae97
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>