message: [appveyor] Remove duplicate entry
diff: BOND_ARCH: 32
  BOND_BOOST: 58
  BOND_CMAKE_FLAGS: "-DBOND_ENABLE_COMM=FALSE;-DBOND_ENABLE_GRPC=FALSE;-DBOND_SKIP_GBC_TESTS=TRUE"
  + # C++ Core build and tests
  - BOND_BUILD: C++
  BOND_VS: "Visual Studio 14 2015"
  BOND_VS_NUM: 14
  BOND_CONFIG: Debug
  - BOND_BUILD: "C# .NET Core"
  BOND_CONFIG: Debug
  - # C++ Core build and tests
  - BOND_BUILD: Doc
  - BOND_BUILD: C#
  BOND_OUTPUT: Fields
  BOND_ARCH: 64
  BOND_BOOST: 63
  BOND_CMAKE_FLAGS: "-DBOND_ENABLE_COMM=FALSE;-DBOND_SKIP_CORE_TESTS=TRUE;-DBOND_SKIP_GBC_TESTS=TRUE"
  - - BOND_BUILD: C#
  - BOND_OUTPUT: Properties
  - BOND_CONFIG: Debug
  # C++ Comm build and tests (Visual C++ 2013)
  - BOND_BUILD: C++
  BOND_VS: "Visual Studio 12 2013"
  