add support for crypto version 5.6.1

var/spack/repos/builtin/packages/cryptopp/package.py

@@ -13,6 +13,7 @@ class Cryptopp(Package):
 
     version('5.6.3', '3c5b70e2ec98b7a24988734446242d07')
     version('5.6.2', '7ed022585698df48e65ce9218f6c6a67')
+    version('5.6.1', '96cbeba0907562b077e26bcffb483828')
 
     def install(self, spec, prefix):
         make()