[Mingw-cross-env-list] -little-endian required for cross building Qt

[Mark Brand]

> > > > The workaround is probably to add "-little-endian" to the configure
> > > > options?
> > > > Would you mind trying that? If it works, I'll patch the configure script
> > > > too.
> > > Adding -little-endian does indeed work and allows the build to
> > > complete and the test program to run.
> > Excellent. Was that for Qt 4.6.2 or Qt 4.7.0-beta1? Can you check on both?
> That was 4.7, 4.6 seems to already have the -little-endian enabled.

Thanks for checking that again. Please let me know if you run into any 
more troubles with Qt 4.7.

I think it makes sense to just add "-little-endian" to the configure 
invocation.  The configure script cannot detect the endianness of a 
cross-target anyway, so it's not surprising that we have to supply it.

The other option would be to derive this from the fact that the target 
is Windows, "-little-endian" is simple and effective.

I made this change to the qt.mk file at the usual URL.

regards,

Mark