configure: check SDL2 function with a header
SDL2 uses SDLCALL to specify a calling convention. On OS/2, it's defined to `_System' which is similar to `_cdecl' but does not prepend '_'. After all, without a header, a function is used without `_System'. And linker will try to `_func' but fail because the function is `func' not `_func'. Reviewed-by: Derek Buitenhuis <derek.buitenhuis@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
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