Fix macOS demo privacy crash.
Fix macOS demo privacy crash.

The macOS demo's Info.plist doesn't contains camera and microphone usage description, which will cause demo crash when starting call.

Bug: none
Change-Id: Ie85b0087e6aa6e768a8e6740fffe0b95891b20dd
Reviewed-on: https://webrtc-review.googlesource.com/c/116703
Reviewed-by: Kári Helgason <79949f6d84ac41ff1f64c59fd5a554be5ff12a02@webrtc.org>
Commit-Queue: Kári Helgason <79949f6d84ac41ff1f64c59fd5a554be5ff12a02@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#26188}
ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc