Fix an issue where the build failed with vv disabled but gstreamer available.
This is kind of ugly, but mediamanager.c is a spaghetti mess of preproc and
this appeared to be the best/quickest way to fix the issue as
PurpleMediaManager isn't fully defined unless vv is enabled.
Testing Done:
Just a compile test with `--disable-vv` as well as no arguments to configure.
Reviewed at https://reviews.imfreedom.org/r/25/
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