shader compilation error opengles android

Following up on !4006 (merged), I'm testing latest libvlc android master build on Android, both opengl es 2 and 3, using the libvlc output_callbacks. Shader compilation error prevents vout from displaying any frame. Full logs: https://gist.github.com/mfkl/de511180d7cf1370c6f9d2b147e9c66e

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