fix hint and gl2 build. NOTE: this does not change that GL2 segfaults right away. that is an issue that dates back at least 50 commits, but most likely even back to the webgl merge. I guess nobody actually tried to run hedgewars in GL2 since back then :P

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find_package(SDL REQUIRED)

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include_directories(${SDL_INCLUDE_DIR})

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add_library (SDLmain STATIC SDLMain.m)

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