cmake problem when building

[samynk]

The 4 SDL libraries give errors when initializing the cmake build system on windows. What typically happens is that the first the build is initiated, the main SDL library is not found and the cmake build system is not fully initialized. The second attempt then finds the sdl main library but not the second sdl library. After repeating this process enough times the build finally works.

Generating the build again and again works but is not user friendly.