Remove 'clang' from install_requires
Remove 'clang' from install_requires

This actually prevents system package from being used, and forces
installation of some 3rd party package from pypi. It happens because
LLVM build system, and thus system packages (python-clang from LLVM
repo, or Arch Linux packages) don't install the .egg-info directory.

trolldbois/ctypeslib,trolldbois/ctypeslib,trolldbois/ctypeslib