host interop + deps fixes for running ring-defaults on jolt

Shaken out getting ring-defaults (and its ring-core/anti-forgery/session stack)
to load and serve static resources on jolt. All general fixes, all runtime:

- Class/forName throws a catchable ClassNotFoundException for a class jolt can't
  back (it returned a broken truthy value for any name, and crashed on use). Lets
  the common (try (Class/forName "optional.Dep") (catch ...)) probe libraries use
  to detect an absent dependency work — e.g. ring's joda-time check.
- deps: reconcile native libs (and source roots) in one step, deduped by library
  identity, instead of the ad-hoc distinct at each call site. An app pulling two
  libs that declare the same shared object (libcrypto via both jolt-crypto and
  http-client) now includes and loads it once.
- io: a File answers getProtocol ("file") / getFile so resource-serving
  middleware that expects io/resource to hand back a file: URL works; the
  classloader gains getResources (every source root holding the resource).
- clojure.string/replace accepts a char match/replacement, like the JVM.

JVM-certified corpus rows for the Class/forName and string/replace behavior.

test/chez/corpus.edn

@@ -1,4 +1,8 @@
 [
+  {:suite "interop / Class.forName" :label "unknown class throws ClassNotFoundException" :expected ":nf" :actual "(try (Class/forName \"no.such.Klass\") (catch ClassNotFoundException _ :nf))"}
+  {:suite "interop / Class.forName" :label "known class resolves" :expected "\"java.lang.String\"" :actual "(.getName (Class/forName \"java.lang.String\"))"}
+  {:suite "clojure.string / replace" :label "char match and replacement" :expected "\"a-b-c\"" :actual "(clojure.string/replace \"a/b/c\" \\/ \\-)"}
+  {:suite "clojure.string / replace" :label "char match, string replacement" :expected "\"x_y\"" :actual "(clojure.string/replace \"x.y\" \\. \"_\")"}
   {:suite "interop-fixes / deprecated #^ metadata reader" :label "#^ type hint on a param" :expected "\"x\"" :actual "(do (defn f1 [#^String s] s) (f1 \"x\"))"}
   {:suite "interop-fixes / deprecated #^ metadata reader" :label "#^\"[B\" array hint" :expected "[1 2]" :actual "(do (defn f2 [#^\"[B\" b] b) (f2 [1 2]))"}
   {:suite "interop-fixes / deprecated #^ metadata reader" :label "#^ is equivalent to ^" :expected "true" :actual "(= (meta (with-meta [] {:tag (quote String)})) {:tag (quote String)})"}