- [osx] set -fvisibility-inlines-hidden in gyp/common.gypi to silence
mismatched visibility linker warnings
- [linux] set cxx_host in GYP_FLAGS to set -fabi-version=0 on gcc builds
to use clang-built mason binaries
- [ios] update symbol visibility for iOS tests
- [ios] link libgeojsonvt.a in iOS tests xcodeproj
- add libgeojsonvt.a to General -> Linked Frameworks and Libraries
- add mason_packages (recursive) to Build Settings -> Library Search Path
- [ios] add libuv and geojsonvt first in iOS libtool smush to ensure symbols
are found by later compilation units where they are undefined
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