The DB2 sql plugin can not be compiled on 64Bit Linux

In the online documentation of Qt5 the following command line is described:

cd $QTDIR/qtbase/src/plugins/sqldrivers/db2
qmake "INCLUDEPATH+=$DB2DIR/include" "LIBS+=-L$DB2DIR/lib -ldb2" db2.pro
make

Which works most likely for building a 32Bit DB2 plugin using DB2 v10.5fp7.
However: for building a 64Bit version of the plugin the preprocessor define
"ODBC64" needs to be defined as well:

cd $QTDIR/qtbase/src/plugins/sqldrivers/db2
qmake "INCLUDEPATH+=$DB2DIR/include" "LIBS+=-L$DB2DIR/lib -ldb2"
"QMAKE_CXXFLAGS+=-DODBC64" db2.pro
make

However: when doing so the source code of
../../../sql/drivers/db2/qsql_db2.cpp
does still not compile due to the use of wrong datatypes.

Several function expect e.g. SQLLEN instead of a SQLINTEGER or SQLULEN instead
of SQLUINTEGER.

Please find attached two patches which fix the compilation of the DB2 plugins
of:

• Qt 4.8.7
• Qt 5.6.0

NOTE: for Qt4 simply take out "qtbase" from the path of the db2 plugin.