Also scan lib/ and ext/ .jars with ClassGraph

At least for JDK/JRE 8, these directories contain `.jar` files with
classes that may need to be instrumented.

Author: fmeum

src/main/java/com/code_intelligence/jazzer/agent/RuntimeInstrumentor.kt

@@ -178,6 +178,7 @@ class RuntimeInstrumentor(
         val className = internalClassName.replace('/', '.')
         val classfileBuffer = maybeClassfileBuffer ?: ClassGraph()
             .enableSystemJarsAndModules()
+            .acceptLibOrExtJars()
             .ignoreClassVisibility()
             .acceptClasses(className)
             .scan()

src/main/java/com/code_intelligence/jazzer/instrumentor/Hooks.kt

@@ -52,6 +52,7 @@ data class Hooks(
             return ClassGraph()
                 .enableClassInfo()
                 .enableSystemJarsAndModules()
+                .acceptLibOrExtJars()
                 .rejectPackages("jaz.*", "com.code_intelligence.jazzer.*")
                 .scan()
                 .use { scanResult ->