crengine: fix `libcrengine.a` symbols visibility

koreader / koreader-base

Base framework offering a Lua scriptable environment for creating document readers

http://koreader.rocks/

GNU Affero General Public License v3.0

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Closed benoit-pierre closed 3 months ago

benoit-pierre commented 3 months ago

We want both -fvisibility-inlines-hidden and -fvisibility=hidden.

This reduce koreader-cre's final code size by ~174-220 KB (and potentially improve performance).

This change is