message: Simply CMake logic for run-examples target
  This is groundwork for MSVC integration for the run-examples target.
  Simplifying this logic as done here avoids needing to use the
  ${CMAKE_CFG_INTDIR} variable to customize the path in which to find
  the example executables (by default, MSVC installs the examples to
  ${CMAKE_BINARY_DIR}/examples/{bson,mongo}cxx/{Debug,Release}/${EXAMPLE}).
diff: @@ -35,12 +35,10 @@ add_custom_target(run-examples DEPENDS examples)
  # Run all mongocxx examples on `make run-examples`.
  foreach(EXAMPLE ${MONGOCXX_EXAMPLE_EXECUTABLES})
  - get_filename_component(EXAMPLE_EXECUTABLE "${CMAKE_BINARY_DIR}/examples/mongocxx/${EXAMPLE}" ABSOLUTE)
  - add_custom_command(TARGET run-examples POST_BUILD COMMAND ${EXAMPLE_EXECUTABLE})
  + add_custom_command(TARGET run-examples POST_BUILD COMMAND ${EXAMPLE})
  endforeach(EXAMPLE)
  # Run all bsoncxx examples on `make run-examples`.
  foreach(EXAMPLE ${BSONCXX_EXAMPLE_EXECUTABLES})
  - get_filename_component(EXAMPLE_EXECUTABLE "${CMAKE_BINARY_DIR}/examples/bsoncxx/${EXAMPLE}" ABSOLUTE)
  - add_custom_command(TARGET run-examples POST_BUILD COMMAND ${EXAMPLE_EXECUTABLE})
  + add_custom_command(TARGET run-examples POST_BUILD COMMAND ${EXAMPLE})
  endforeach(EXAMPLE)
  