Revert "Remove the flag PORTALLOCATOR_ENABLE_ANY_ADDRESS_PORTS."
Revert "Remove the flag PORTALLOCATOR_ENABLE_ANY_ADDRESS_PORTS."

This reverts commit b3f5aed4332b25c3fa7e725126efd3d4262c385e.

Reason for revert: speculative revert, possibly breaking downstream projects

Original change's description:
> Remove the flag PORTALLOCATOR_ENABLE_ANY_ADDRESS_PORTS.
> 
> We now always enable any address ports, only using them if they end up
> using interfaces that weren't otherwise accessible. This flag is no
> longer used by downstream projects.
> 
> TBR=deadbeef@webrtc.org
> 
> Bug: None
> Change-Id: I6e4e93958cbc4300811bafb103f1a2e8732274ed
> Reviewed-on: https://webrtc-review.googlesource.com/85860
> Commit-Queue: Qingsi Wang <qingsi@google.com>
> Reviewed-by: Qingsi Wang <1c4f50fe02fab79f81be17f4e2f574c199f33efd@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#23751}

TBR=qingsi@google.com,1c4f50fe02fab79f81be17f4e2f574c199f33efd@webrtc.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: None
Change-Id: I2c3850533cd72c021a42dcb160f73ca54a036a84
Reviewed-on: https://webrtc-review.googlesource.com/95341
Commit-Queue: Qingsi Wang <1c4f50fe02fab79f81be17f4e2f574c199f33efd@webrtc.org>
Reviewed-by: Qingsi Wang <1c4f50fe02fab79f81be17f4e2f574c199f33efd@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#24373}
TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc