And remove the patch that was merged upstream.

This is an update of 30 releases...
It might break some setups, hopefully not.

Patch submitted upstream

Move to meson, github, tar.xz, support msvc and bionic by default...

No security issue, AFAIK

No obvious security issue, but we never know...

It includes the patch from Hugo to fix the PKG_CONFIG_PATH usage.

This fixes a crash when changing the volume while using the file aout module.

Regression from:

commit 8fb81d08
Author: Rémi Denis-Courmont <remi@remlab.net>
Date:   Sat May 5 13:06:19 2018 +0300

    aout: inline some functions

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Pipeline passed: https://code.videolan.org/chouquette/vlc/pipelines/15284

Instead of copying the header files around, change the triplet
canonicalization function to correctly remove version numbers for
darwin triplets.

The synchro module should not print messages when the quiet-synchro
option is set. To simplify this, add two new helper macros for
debug and warning messages (which currently are the only message
types used in this code) and use those instead of always explicitly
checking the b_quiet variable.

This is already handled by the stdcxx_14.m4 macro

Un-doxygens a lot of doc comments that were already present in the
header file and removes the redundant long descriptions as those are
just prone to get outdated and never updated along with the proper
doc comments in the header.

Change the doc comments for the internal functions to proper
doxygen with the functions marked as internal.