Konstantin Käfer d53c7860cd [build] use optional polyfill on Android, and upgrade to NDK r19 ...

<experimental/optional> is not available anymore in newer STL versions, e.g. according to libc++'s TS deprecation policy: https://libcxx.llvm.org/TS_deprecation.html

2019-01-21 17:00:31 +01:00

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