devel/py-llvmlite: Update to 0.22.0

Port changes:

• Changed to DISTVERSION
• Added LIB_DEPENDS for llvm50
• Updated LLVM_VER to 50
• Added stripping

PR: 226306
Submitted by: David Kalliecharan <dave@dal.ca> (maintainer)
Approved by: tcberner (mentor, implicit)