libamplsolver: fix runtime error on darwin

pkgs/development/libraries/science/math/libamplsolver/default.nix

···
     install -D -m 0644 *${stdenv.hostPlatform.extensions.sharedLibrary}* -t $out/lib
     install -D -m 0644 *.a -t $out/lib
     popd
+  '' + lib.optionalString stdenv.isDarwin ''
+    install_name_tool -id $out/lib/libamplsolver.dylib $out/lib/libamplsolver.dylib
+  '' + ''
     runHook postInstall
   '';