build-unit-test-docker: Add fmtlib

An open-source formatting library for C++. It can be used as a
safe and fast alternative to (s)printf and iostreams.

This will be used by future projects in openbmc

Change-Id: Icacfbf7a41836c6c90581240a65266eaa4249e9a
Signed-off-by: William A. Kennington III <wak@google.com>
1 file changed