Update CMake to support Mac OS X 10.14

[pcmoritz]

What do these changes do?

On Mac OS 10.14, pyarrow doesn't compile unless we pass -stdlib=libc++ as cflags into it. I suspect this change should work as far back as 10.9, but that should be tested.

Related issue number

#3210

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[robertnishihara]

Compilation failing on Travis with

-- Running cmake for pyarrow
cmake -DPYTHON_EXECUTABLE=/Users/travis/miniconda/bin/python  -DPYARROW_BUILD_PARQUET=on -DPYARROW_BOOST_USE_SHARED=on -DPYARROW_BUILD_PLASMA=on -DPYARROW_USE_TENSORFLOW=on -DPYARROW_BUNDLE_ARROW_CPP=ON -DCMAKE_BUILD_TYPE=release /Users/travis/build/ray-project/ray/build/external/arrow/src/arrow_ep/python
[ 37%] �[32m�[1mLinking CXX static library liblocal_scheduler_client.a�[0m
[ 37%] Built target local_scheduler_client
�[35m�[1mScanning dependencies of target ray_objlib�[0m
-- The C compiler identification is AppleClang 9.1.0.9020039
-- The CXX compiler identification is AppleClang 9.1.0.9020039
-- Check for working C compiler: /Applications/Xcode-9.4.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc
-- Check for working C compiler: /Applications/Xcode-9.4.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /Applications/Xcode-9.4.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
[ 38%] �[32mBuilding CXX object src/ray/CMakeFiles/ray_objlib.dir/id.cc.o�[0m
-- Check for working CXX compiler: /Applications/Xcode-9.4.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -- broken
CMake Error at /Users/travis/miniconda/lib/python2.7/site-packages/cmake/data/CMake.app/Contents/share/cmake-3.12/Modules/CMakeTestCXXCompiler.cmake:45 (message):
  The C++ compiler

    "/Applications/Xcode-9.4.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: /Users/travis/build/ray-project/ray/build/external/arrow/src/arrow_ep/python/build/temp.macosx-10.6-x86_64-2.7/CMakeFiles/CMakeTmp
    
    Run Build Command:"/usr/bin/make" "cmTC_54a33/fast"
    /Applications/Xcode-9.4.1.app/Contents/Developer/usr/bin/make -f CMakeFiles/cmTC_54a33.dir/build.make CMakeFiles/cmTC_54a33.dir/build
    Building CXX object CMakeFiles/cmTC_54a33.dir/testCXXCompiler.cxx.o
    /Applications/Xcode-9.4.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++    '-stdlib=libc++'  -isysroot /Applications/Xcode-9.4.1.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -mmacosx-version-min=10.6   -o CMakeFiles/cmTC_54a33.dir/testCXXCompiler.cxx.o -c /Users/travis/build/ray-project/ray/build/external/arrow/src/arrow_ep/python/build/temp.macosx-10.6-x86_64-2.7/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
    clang: error: invalid deployment target for -stdlib=libc++ (requires OS X 10.7 or later)
    make[4]: *** [CMakeFiles/cmTC_54a33.dir/testCXXCompiler.cxx.o] Error 1
    make[3]: *** [cmTC_54a33/fast] Error 2

  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:25 (project)

-- Configuring incomplete, errors occurred!

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[raulchen]

@pcmoritz I'm getting the following error, unless I change 10.7 to 10.14 here. Any idea why?

cmake -DPYTHON_EXECUTABLE=/Users/haochen/.pyenv/versions/3.6.5/bin/python  -DPYARROW_BUILD_PARQUET=on -DPYARROW_BOOST_USE_SHARED=on -DPYARROW_BUILD_PLASMA=on -DPYARROW_USE_TENSORFLOW=on -DPYARROW_BUNDLE_ARROW_CPP
=ON -DCMAKE_BUILD_TYPE=release /Users/haochen/code/ant_ray/build/external/arrow/src/arrow_ep/python
error: $MACOSX_DEPLOYMENT_TARGET mismatch: now "10.7" but "10.14" during configure

I'm on macOS 10.14.