rust: update micro-timer dependency
The new version uses a much more robust technique and should remove any existing
risk of bad compiler error or performance hit.
Differential Revision: https://phab.mercurial-scm.org/D8319
# Rust builds with a modern MSVC and uses a newer CRT.
# Python 2.7 has a shared library dependency on an older CRT (msvcr90.dll).
# We statically link the modern CRT to avoid multiple msvcr*.dll libraries
# being loaded and Python possibly picking up symbols from the newer runtime
# (which would be loaded first).
[target.'cfg(target_os = "windows")']
rustflags = ["-Ctarget-feature=+crt-static"]