Fix bundled build on Fedora
Fix bundled build on Fedora

Fedora uses "lib64" for the CMake output directory. The current search
path is limited to "lib". This fix searches in "lib" and "lib64 for
applicable libraries in a bundled build.

Cobrand/rust-sdl2,Cobrand/rust-sdl2,Rust-SDL2/rust-sdl2,Rust-SDL2/rust-sdl2,Cobrand/rust-sdl2,Rust-SDL2/rust-sdl2