- Fix build for Leap 42.3: Force use of GCC7.

- Update to version 1.6.0: 
  * Support for effects that work as compute shaders. Compute
    shaders are generally slower than fragment shaders for the same
    algorithm, but allow some forms of communication between shader
    invocations and have more flexible output, which can enable
    more efficient algorithms. See effect.h for more details. Note
    that the fastest rendering API on EffectChain is now to a
    texture if possible, not to an FBO. This will only matter if
    the last effect is a compute shader.
  * Movit now includes a compute shader implementation of
    DeinterlaceEffect, which is automatically used instead of the
    fragment shader implementation if your GPU and OpenGL driver
    supports it (in practice, this means on all platforms except on
    macOS). The compute shader version is typically 20–80% faster
    than the fragment shader version, depending on your GPU and
    other factors.
    A compute shader implementation of ResampleEffect was written but
    ultimately failed to be faster, and so is not included.
  * Support for microbenchmarks of effects through the Google
    microbenchmarking framework (optional). Currently,
    DeinterlaceEffect and ResampleEffect has benchmarks; enable
    them by running the unit test with --benchmark (also try
    --benchmark --help).
  * Effects can now explicitly request _not_ to have mipmaps, which
    means they can do so without needing to request bounce and
    fiddling with the sampler state. Note that this is an API
    change for effects.
  * Movit now requires C++11, both to build and to #include the

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