The `postPatch` phase is failing when no `.pyc` file is generated in
`tests` by the build (`rm: missing operand` error).
As per @jonringer's comment, the whole `postPatch` is not needed anymore.
* Tested the package build
- *NOT* tested the packages relying on capstone...
* Added `setupPyBuildFlags` to avoid the error
"ERROR: capstone-3.0.5.post1-py3-none-manylinux1_x86_64.whl is not a
supported wheel on this platform."