Snippets for exiv2 0.28.8 from Nix aarch64-darwin

Sourced from https://hydra.nixos.org/log/n0k21f7ay9kncam4mk8hy609jlm0alnl-exiv2-0.28.8.drv.

• /nix/var/nix/builds/nix-87893-1263199870/source/xmpsdk/src/XMPMeta.cpp:752:17: warning: variable 'opt1' set but not used [-Wunused-but-set-variable]
    752 |         XMP_OptionBits opt1 = 0;        // Check the general option bit macros.
        |                        ^
  

• /nix/var/nix/builds/nix-87893-1263199870/source/xmpsdk/src/XMPMeta.cpp:753:17: warning: variable 'opt2' set but not used [-Wunused-but-set-variable]
    753 |         XMP_OptionBits opt2 = flag;
        |                        ^