capnproto update to 7.0dev

pans

2017-08-09 1ec5ff7b1443e4b205b953875fd876fd6e76fce0

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F:/workspace2/VisitFace/DemoForBsk/app/.externalNativeBuild/cmake/release/mips/CMakeFiles/native-codec-jni.dir 
F:/workspace2/VisitFace/DemoForBsk/app/.externalNativeBuild/cmake/release/mips/CMakeFiles/edit_cache.dir 
F:/workspace2/VisitFace/DemoForBsk/app/.externalNativeBuild/cmake/release/mips/CMakeFiles/rebuild_cache.dir