clangrtool py3 compatibility: remove md5 import
clangrtool py3 compatibility: remove md5 import

The md5 import isn't used, and doesn't exist in Python 3.

This doesn't necessairly make the tool 100% Python 3 compatible, but
does remove one known blocker.

PiperOrigin-RevId: 206936575

bazelbuild/rules_apple,bazelbuild/rules_apple,bazelbuild/rules_apple,bazelbuild/rules_apple