[Vala] About vala, glib 2.42 and deadlocks

[Luca Bruno <lethalman88 gmail com>]

Since glib 2.41.2, the mutex/cond implementation on Linux has changed. The
code compiled with Vala < 0.26 which targets at least glib 2.32 with
--target-glib 2.32 will suffer from deadlocks.

Your options are either:
- Do not --target-glib 2.32
- Update Vala to at least 0.25.2
- Downgrade glib

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