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* vr: capture the microphone for voice chat on Build 2998
On the vr branch Roblox 2.736.1408 joins voice chat and plays other
players, but never opens a microphone: its FmodAudioDevice capture
methods have no working host path, and main's native capture (537828a
"Fix vc") is pinned to 2.738 RVAs.
Port main's NativeInputCapture and interpose the FmodAudioDevice capture
slots for Build 2998. 2.738 inserted two device-list slots (7 and 11),
so the capture methods sit at {4, 11..15} here instead of {4, 13..17}.
The input-device slots {8, 9, 10, 16}, checked against main's input RVAs
for this image, anchor that layout before anything is patched, and each
capture slot must be a distinct method next to the input-device code.
The voice sink is called through its own vtable after checking that the
vtable and its PCM entry point lie in libroblox, and the retained
shared_ptr is released through the libc++ control-block ABI, so no
further Build 2998 RVAs are needed. If any check fails, capture stays
off and the output routes still work.
MOCKTAIL_NATIVE_INPUT_CAPTURE=0 turns the capture interposition off, and
audio.input_device: disabled reports no microphone to Roblox.
* Requested fix at PR 181