message: appveyor: use 64 bit toolchain
diff: @@ -38,6 +38,7 @@ environment:
  - TEST_NAME: trig
  - TEST_NAME: vector
  build_script:
  +- set preferredToolArchitecture=x64
  - cmake -G "Visual Studio 15 2017" -A "x64" -DCMAKE_SUPPRESS_REGENERATION=1 -DTEST_NAME=%TEST_NAME%
  - set MSBuildLogger="C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
  - cmake --build . --config %CONFIGURATION% -- /v:m /m /logger:%MSBuildLogger%
  