[poky] nativesdk-python3 support for mingw

[Dominik Holland]

Hi,

not sure whether my last mail on this actually got on the list (didn't found it on the archive, so sending it again...)

i tried to create a mingw-based windows SDK using poky which also
contains python3 (nativesdk-python3).

It looked like nobody have tried to do this before (or support for it
was removed again ?). So i fixed a few recipes (db, gdbm, ncurses,
readline, openssl) to compile with mingw.

Aftwards i also fixed python3 and got it working in a packaged SDK. To
do that i applied the patches from the mingw package maintainers (~80
patches).

My question is whether all these fixes for the mentioned packages are
wanted ? Is there an interest in supporting a full fledged mingw SDK ?

And are you also interested in the mingw patches for mingw (I didn't
check whether i need all of them, that's probably some python expert
should check).

Thx

 Dominik