message: Update Building.md
  `cmake . -D FLATBUFFERS_CXX_FLAGS="Wno-error"` returns an error (file 'Wno-error' not found)
diff: @@ -45,7 +45,7 @@ It is possible to cancel `warnings as errors` flag at `cmake` configuration stag
  appended to the project-level `CMAKE_CXX_FLAGS` variable.
  Examples:
  -- GCC and Clang: `cmake . -D FLATBUFFERS_CXX_FLAGS="Wno-error"`
  +- GCC and Clang: `cmake . -D FLATBUFFERS_CXX_FLAGS="-Wno-error"`
  - MSVC: `cmake . -D FLATBUFFERS_CXX_FLAGS="/WX-"`
  - MSVC: `cmake . -D FLATBUFFERS_CXX_FLAGS="/Wv <compiler.version>"`
  