Game won't build when FSO_USE_VOICEREC is enabled on freshly cloned copy of the project

When I first tried building the project, it failed, complaining about the lack of the phrases.cfg file.
The oldest mention I could find of this issue is in this [forum thread](https://www.hard-light.net/forums/index.php?topic=91909). While they say it was solved, it might have regressed at some point.

Talking to @Goober5000 on Discord, he said
> I looked through the project file. There's no actual custom build step to build phrases.cfg
My guess is this was never done when we switched to CMake. It existed in the old Visual Studio project files.

Currently, to build the project from a freshly cloned copy on Windows, FSO_USE_VOICEREC needs to be disabled.