collab: Make unsupported for MinGW toolchain (#23518)

Closes #23451

reverts #23117 for MinGW. collab can't be compiled for MinGW because
webrtc itself doesn't support MinGW compilers

Release Notes:

- N/A
64a5153bb5Maksim Bondarenkov committed on 1/26/2025, 9:01:20 AM· committed by GitHubparent5d005a7
10 files changedLine totals unavailable