new packages: libspatialite 4.2.0, spatialite-tools, fix libfreexl pkg-config

I have managed to compile spatialite executables (spatial-extended sqlite), but some patching was done.
Could you have a look? (I'll comment the problematic places of code)
I think it would be better to fix geos (install geos-config script, not mingw....-geos-config). We have separate 32/64 bit binary directories, so there will be no conflicts.