qt 3.1 port planing

[Ralf Habacker]

> So it seems to me to use the original qt3.1.0rc1 qt sources (without 
> the #ifdef
> __CYGWIN__ patches) and build only the left things.
> 
An example for doing this is below mentioned (from unixmake.cpp) 

	if ( project->isEmpty("QMAKE_CYGWIN_SHLIB") ) {
	    project->variables()["QMAKE_EXTENSION_SHLIB"].append( "so" );
	} else {
	    project->variables()["QMAKE_EXTENSION_SHLIB"].append( "dll" );
	}


Ralf