* Bump minimum cmake required to 3.3.2, to make sure generator
expressions work.
* Force CMAKE_BUILD_TYPE to "Release" if unset, not sure if this
actually works.
* Merge the older compile flags block with the new one and use generator
expressions to make sure the relevant flags apply only to C, C++ or
nasm.
* Add -lssp to the end of the link commands for the -fstack-protector*
options, this is only needed/done for gcc.
* Add -lversion and -limm32 to SDL2_LIBRARY (Zach asked for this.)
* Builds on msys2 again!
55f6e17f0d