Qt4 frontend and -mms-bitfields option

[Abdelrazak Younes]

Dear Georg,

Don't ask me why but in order for the Qt4 frontend to work correctly, I 
had to modify the Makefile and remove the '-mms-bitfields' option from 
CXXFLAGS. Without this, under Windows, the QWorkarea has an unchangeable 
size of -743x1 and the work area remains black. That's maybe also a 
solution for the slowness and crashes you have seen under X11.

Could you please modify the autotools script so that the qt4 frontend is 
compiled without '-mms-bitfields' ?

Thanks in advance,
Abdel.