Commit 4f0bb60c authored by Stéphane Cerveau's avatar Stéphane Cerveau 🤸🏻

meson: update glib minimum version to 2.56

In order to support the symbol g_enum_to_string in various
project using GStreamer ( gst-validate etc.), the glib minimum
version should be 2.56.0.

Remove compat code as glib requirement
is now > 2.56

Version used by Ubuntu 18.04 LTS

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