Development branch: https://gitlab.winehq.org/baskanov/wine/-/commits/l3codecx/
v2: Removed l3codecx.ax stub dll.
v3: Rebased.
-- v3: l3codecx.ax/tests: Add tests for querying MPEG layer-3 decoder pin info. l3codecx.ax/tests: Add tests for IBaseFilter_FindPin() on MPEG layer-3 decoder. l3codecx.ax/tests: Add tests for IBaseFilter_EnumPins() on MPEG layer-3 decoder. l3codecx.ax/tests: Test MPEG layer-3 decoder unconnected filter state. l3codecx.ax/tests: Add tests for MPEG layer-3 decoder aggregation. l3codecx.ax/tests: Add tests for MPEG layer-3 decoder interfaces.