* configure script:
- Also check for python3.3-config in addition to python-config and others.
- Add missing -fvisibility=hidden to default CFLAGS.
- Fix CFLAGS handling (configure.ac amends CFLAGS, doesn't overwrite now).
* configure script:
- Also check for python3.3-config in addition to python-config and others.
- Add missing -fvisibility=hidden to default CFLAGS.
- Fix CFLAGS handling (configure.ac amends CFLAGS, doesn't overwrite now).