Set swig -outdir to build directory
It makes much later python3 versions get outdated src/M2Crypto/m2crypto.py, instead of generating it fresh directly into build directory. Put generated files into build directory only.
Closes #294
It makes much later python3 versions get outdated src/M2Crypto/m2crypto.py, instead of generating it fresh directly into build directory. Put generated files into build directory only.
Closes #294