Fix build

[siboehm]

python -c "from procgen import ProcgenGym3Env; ProcgenGym3Env(num=1, env_name='coinrun')"
building procgen...RUN FAILED ['cmake', '--build', '.', '--config', 'relwithdebinfo']:
[  3%] Building CXX object CMakeFiles/env.dir/src/cpp-utils.cpp.o
[  6%] Building CXX object CMakeFiles/env.dir/src/basic-abstract-game.cpp.o
[ 13%] Building CXX object CMakeFiles/env.dir/src/game-registry.cpp.o
[ 16%] Building CXX object CMakeFiles/env.dir/src/assetgen.cpp.o
[ 16%] Building CXX object CMakeFiles/env.dir/src/game.cpp.o
[ 20%] Building CXX object CMakeFiles/env.dir/src/games/bigfish.cpp.o
[ 23%] Building CXX object CMakeFiles/env.dir/src/games/bossfight.cpp.o
[ 26%] Building CXX object CMakeFiles/env.dir/src/games/caveflyer.cpp.o
[ 30%] Building CXX object CMakeFiles/env.dir/src/entity.cpp.o
[ 33%] Building CXX object CMakeFiles/env.dir/src/games/dodgeball.cpp.o
clang-11clang-11: clang-11clang-11: : clang-11: : clang-11error: errorerrorerror: clang-11the clang compiler does not support '-march=native': : errorerrorclang-11the clang compiler does not support '-march=native': 
: 
clang-11the clang compiler does not support '-march=native': 
clang-11: : the clang compiler does not support '-march=native': the clang compiler does not support '-march=native'error: error
: the clang compiler does not support '-march=native'
error: the clang compiler does not support '-march=native'the clang compiler does not support '-march=native'
: the clang compiler does not support '-march=native'
error: the clang compiler does not support '-march=native'


make[2]: *** [CMakeFiles/env.dir/src/assetgen.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: *** [CMakeFiles/env.dir/src/games/bigfish.cpp.o] Error 1
make[2]: *** [CMakeFiles/env.dir/src/basic-abstract-game.cpp.o] Error 1
make[2]: *** [CMakeFiles/env.dir/src/games/caveflyer.cpp.o] Error 1
make[2]: *** [CMakeFiles/env.dir/src/cpp-utils.cpp.o] Error 1
make[2]: *** [CMakeFiles/env.dir/src/games/bossfight.cpp.o] Error 1
make[2]: *** [CMakeFiles/env.dir/src/entity.cpp.o] Error 1
make[2]: *** [CMakeFiles/env.dir/src/games/dodgeball.cpp.o] Error 1
make[2]: *** [CMakeFiles/env.dir/src/game.cpp.o] Error 1
make[2]: *** [CMakeFiles/env.dir/src/game-registry.cpp.o] Error 1
make[1]: *** [CMakeFiles/env.dir/all] Error 2
make: *** [all] Error 2

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/siboehm/repos/procgen/procgen/env.py", line 246, in __init__
    super().__init__(num, env_name, options, **kwargs)
  File "/Users/siboehm/repos/procgen/procgen/env.py", line 96, in __init__
    lib_dir = build(debug=debug)
  File "/Users/siboehm/repos/procgen/procgen/builder.py", line 138, in build
    check(run(build_cmd), verbose=package)
  File "/Users/siboehm/repos/procgen/procgen/builder.py", line 47, in check
    raise RunFailure("failed to build procgen from source")
procgen.builder.RunFailure: failed to build procgen from source