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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
M
Maksim Bondarenkov committed
64a5153bb5d50f0a40a0e64e374888f0b11628fc
Parent: 5d005a7
Committed by GitHub <noreply@github.com> on 1/26/2025, 9:01:20 AM