Libsndfile was unintentionally compiled without OGG/Vorbis support. That's because libopus was missing. When compiling libsndfile with autotools [you get a nice warning](9349a566e2/configure.ac (L381-L386)). When using CMake you don't...
Solution: Compile libopus before compiling libsndfile. Now it reports
```
-- The following features have been enabled:
* ENABLE_EXTERNAL_LIBS, enable FLAC, Vorbis, and Opus codecs
```
The unit tests keep failing when compiling with MinGW x86 on x64 Windows10. This is related to the change introduced in #629. The exact reason for the failure is unknown. I assume it's a broken MinGW implementation of the function `fgetpos()` or `_fseeki64()`, as the tests run fine for WindowsXP x86. However, I have little interest in further investigation, as I don't consider using MinGWx86 on x64 to be a valid use-case.
Pipelines should not be triggered when other pipelines are modified. This saves many resources when messing around with a single pipeline, because other pipelines won't run.
