[PyKDE] More 3.7 compile issues

[Rob Knapp]

I'm currently compiling on a win32 platform and the build process reported 
that sipBadLengthForSlice was an unknown identifier.  The line number
provided was line 130 in spi/qstringlist.sip.

For the time being I've hacked the .sip file to simply return NULL in those 
circumstances since my immediate needs don't require that class...however it 
would be nice to have the option of using it in future.

However, there is a larger problem.  When I reach the end of my compilation 
and attempt to import qt I get this:

Traceback (most recent call last):
	File "<stdin>" line 1, in ?
	File "d:\projects\lib\qt.py", line 924 in ?
	libqtc.sipRegisterClasses()
SystemError: Unable to find class object for QSignalMapper

I've tried defining QT_NO_SIGNALMAPPER in qconfig.h to get around this, but 
that just generates compile errors.