qte 2.3.10: Rethink hardware platform defines.

qte 2.3.10: Rethink hardware platform defines.
* Let there be two major platforms, Zaurus and Wince. Let there be
two defines, QT_QWS_SL5XXX and QT_QWS_IPAQ, to define generic device
of the corresponding platform.
* Let there be also possibility to specialize for specific device of the
platform. But corresponding define must be always used bu the generic platform
device above.
* For example, QT_QWS_SLC700 is a Zaurus C7x0 device, and it always must be
defined together with QT_QWS_SL5XXX. Or QT_QWS_SIMPAD, an QT_QWS_IPAQ
specialization.
* As generic define is implied by specific, if we somewhere have test for
generic define, we don't need to additionally test for "specific" define.
* Thus, bunch of hunks in device-specific patches are superflous and can be
dropped.