Revert "Simplify configuration for cargo deny"

This reverts commit 253d639.

Author: djc

deny.toml

@@ -1,4 +1,11 @@
 [licenses]
+allow = ["MPL-2.0"]
 allow-osi-fsf-free = "either"
 copyleft = "warn"
+exceptions = [{ allow = ["ISC", "MIT", "OpenSSL"], name = "ring" }]
 private = { ignore = true }
+
+[[licenses.clarify]]
+name = "ring"
+expression = "ISC AND MIT AND OpenSSL"
+license-files = [{ path = "LICENSE", hash = 0xbd0eed23 }]