pkg-config .pc files: added .private versions of Libs and Required #667
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To prevent top-level linking of all libraries.
Problem:
pkg-config --libs toxcore
returns all libraries that arerequired by all libtox*.so libraries. This is wrong because for a
dynamically linked executable only top-level libraries need to be
supplied.
pkg-config --libs --static toxcore
should return alllibraries for the statically linked executable.
For example, the ToxBot https://github.com/JFreegman/ToxBot executable
uses pkg-config and is linked with the opus library, which is wrong.
Based on #533.
This change is