modules: updated FindCorrade.cmake and FindMagnum.cmake.
Merge branch 'master' into ports
modules: updated FindSDL2.cmake.
Updated toolchains submodule.
Merge branch 'master' into ports
triangle: ported to Android.

Ignoring all generated stuff, it can always be regenerated using android
update project.
textured-triangle: ported to Android.

Also ignoring generated mess.
primitives: ported to Android.

Also ignoring generated stuff. The input events don't report touch as
left mouse button, thus ignoring the check.