message: Update README now that Java is optional
diff: @@ -122,9 +122,12 @@ To build Filament, you must first install the following tools:
  - repo
  - CMake 3.4 (or more recent)
  - clang 5.0 (or more recent)
  -- OpenJDK 1.8 (or more recent)
  - [ninja 1.8](https://github.com/ninja-build/ninja/wiki/Pre-built-Ninja-packages) (or more recent)
  +To build the Java based components of the project you can optionally install (recommended):
  +
  +- OpenJDK 1.8 (or more recent)
  +
  Additional dependencies may be required for your operating system. Please refer to the appropriate
  section below.
  @@ -173,6 +176,12 @@ To install the libraries and executables in `out/debug/` and `out/release/`, add
  You can force a clean build by adding the `-c` flag. The script offers more features described
  by executing `build.sh -h`.
  +You can skip building the Java based components of the projects by using the `-j` flag:
  +
  +```
  +$ ./build.sh -j release
  +```
  +
  #### Linux
  Make sure you've installed the following dependencies:
  