kripke: fix install (#11090)

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

@@ -35,4 +35,4 @@ def install(self, spec, prefix):
         # Kripke does not provide install target, so we have to copy
         # things into place.
         mkdirp(prefix.bin)
-        install('spack-build/kripke', prefix.bin)
+        install('../spack-build/kripke', prefix.bin)