Segmentation fault when loading the library if Godot is built with system-provided harfbuzz

[j20001970]

If harfbuzz is system-provided instead of builtin when building Godot, loading GDMP library will cause immediate crash on said builds.

This is a problem because unlike official Godot editor that has everything builtin, distribution packagers might configure Godot to use system library for some modules (e.g. Arch, Flatpak), and users of these builds will run into such issue.

The crash is triggered by calling std::call_once during static initialization of the library.

Upstream issue: godotengine/godot#91401

Known workarounds:

• Preload GDMP library with LD_PRELOAD environment variable.
• Configure icu4c the same way as harfbuzz when building Godot, however writing to stdout from GDExtension will lead to segfault if icu4c is system-provided. (Writing to stdout from GDExtension crash the engine with system-provided icu4c godotengine/godot#100301)