Bug#796310: libgraphicsmagick3: --with-quantum-depth=16 breaks ABI

[Jakub Wilk]

Package: libgraphicsmagick3
Version: 1.3.20-4
Severity: serious

As I said in #795102, building with QuantumDepth=16 breaks the ABI.

Please either revert the QuantumDepth change, or change the SONAME.

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Jakub Wilk