This script is based on the mxe package and builds everything from source
instead of using the mingw packages from Fedora as I did in the past.
I'm keeping the old script around for now, but eventually I should remove it as
this is the current way to create a working installer that supports both 32 and
64 bit Windows and is Qt5 based.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>