Runtime Binding Generator depends on deprecated APIs

[vmutafov]

Currently, the Runtime Binding Generator depends on the DexFile API which is deprecated and there are warnings of its usage when building the runtime which in turn fails the build. This API, however, has no new equivalent alternative. All of the alternatives can load DEX files but not using the system class loader. In order to use PathClassLoader or DexClassLoader, some changes in the Runtime should be made in order to load classes from multiple different classloaders.