option(ITK_USE_SYSTEM_GOOGLETEST "Use an outside build or install \
source of GoogleTest. Set GTEST_ROOT to specify location." ${ITK_USE_SYSTEM_LIBRARIES})
mark_as_advanced(ITK_USE_SYSTEM_GOOGLETEST)

option(ITK_USE_SYSTEM_GOOGLETEST "Use an outside build or installed source of GoogleTest. Set GTEST_ROOT to specify location." ${ITK_USE_SYSTEM_LIBRARIES})
mark_as_advanced(ITK_USE_SYSTEM_GOOGLETEST)

Use single line for string argument, by-pass multi-line issues
COMP: Use single line for string argument, by-pass multi-line issues

This addresses the following CMake configuration error:
CMake Error at Modules/ThirdParty/GoogleTest/itk-module-init.cmake:1
(option):
  Syntax error in cmake code at

    /home/kitware/Dashboards/src/ITK/Modules/ThirdParty/GoogleTest/itk-module-init.cmake:1

  when parsing string

    Use an outside build or install \

  source of GoogleTest.  Set GTEST_ROOT to specify location.

  syntax error, unexpected cal_SYMBOL, expecting $end (91)

Change-Id: I6d2d61d4ed2a3a12b166a4dd3a9531ddf8bc2066
