So, using this Makefile (adapted from my
SM 1.6 updated sample extension files and the sample_mm Makefile), I've compiled new versions of this for HL2:DM, DoD:S, CS:S, and TF2.
I haven't compiled (or tested) other versions.
I've also included a vdf file since it appears to have gone missing... it assumes you're putting the .so in the addons/cef/ directory. The VDF file itself goes in the addons/metamod/ directory.
Unfortunately, I can't tell if MM:S supports multiple versions of a plugin side by side like SM extensions do. I know it won't load cef_mm_i486.2.tf2.so with this .vdf, but I could have the naming syntax wrong.