Update python-llvmlite to 0.34.0 and rebuild for LLVM 10

Summary: This release upgrades to LLVM 10. Full changelog is available here.

Test Plan: Use with numba to run a test Python file

Reviewers: Triage Team, JoshStrobl

Reviewed By: Triage Team, JoshStrobl

Subscribers: JoshStrobl

Differential Revision: https://dev.getsol.us/D9689