Remove stack fix from all python containers

[matrixik]

Looks like we probably could remove this fix from containers, we only need to rebuild them with newer Python.

To remove: stack-fix.c and building and using stack-fix.so.

After https://github.com/docker-library/python/commit/8717dc2523c8093990cb958bb8c47ade6f851c05 and https://github.com/docker-library/python/commit/f45e1fb3d57ccce5042d22f4fb618c4dc56d1819 Newer containers with Python have bigger stack (1 MB). So this problem should not happen again with ujson.

Relevant issues: #160 https://github.com/docker-library/python/issues/211