message: No multiline on Windows batch files
diff: @@ -212,10 +212,7 @@ def doBuildWindows(String buildType, boolean isUWP, String arch) {
  dir('build-dir') {
  bat """
  - cmake ${cmakeDefinitions} -DREALM_BUILD_LIB_ONLY=1 \\
  - -G \"Visual Studio 14 2015${archSuffix}\" \\
  - -D CPACK_SYSTEM_NAME=${isUWP?'UWP':'Windows'}-${arch} \\
  - -D CMAKE_BUILD_TYPE=${buildType} ..
  + cmake ${cmakeDefinitions} -DREALM_BUILD_LIB_ONLY=1 -G \"Visual Studio 14 2015${archSuffix}\" -D CPACK_SYSTEM_NAME=${isUWP?'UWP':'Windows'}-${arch} -D CMAKE_BUILD_TYPE=${buildType} ..
  cmake --build . --config ${buildType}
  cpack -C ${buildType} -D CPACK_GENERATOR=TGZ
  """
  