Utilities/Release: Drop macOS .tar.Z binary

On macOS the gzip tool is universally available, so our `.tar.gz` is
sufficient.

Utilities/Release/osx_release.cmake

@@ -4,7 +4,7 @@ set(BOOTSTRAP_ARGS "--prefix=/ --docdir=doc/cmake")
 set(HOST dragnipur)
 set(MAKE_PROGRAM "make")
 set(MAKE "${MAKE_PROGRAM} -j5")
-set(CPACK_BINARY_GENERATORS "DragNDrop TGZ TZ")
+set(CPACK_BINARY_GENERATORS "DragNDrop TGZ")
 set(CPACK_SOURCE_GENERATORS "TGZ TZ")
 set(CPACK_DMG_FORMAT "UDBZ") #build using bzip2 for smaller package size
 set(CC clang)