Fix pcraster raster format build with CMake 2.8.x

[kordejong]

-- peacock: packages to build: pcraster_raster_format;boost;qt;qwt;gdal;fern;pcraster
CMake Error at cmake/package/pcraster_raster_format/1.3.1/build.cmake:8 (set):
  Syntax error in cmake code at


/home/user/Development/projects/peacock/cmake/package/pcraster_raster_format/1.3.1/build.cmake:14

  when parsing string

    7i \

  if(WIN32)\\n\

      set(CMAKE_DEBUG_POSTFIX \"d\")\\n\

  endif()

  syntax error, unexpected cal_SYMBOL, expecting $end (15)
Call Stack (most recent call first):
  cmake/PeacockBuild.cmake:7 (include)
  cmake/Peacock.cmake:11 (include)
  CMakeLists.txt:13 (include)


CMake Error at cmake/package/pcraster_raster_format/1.3.1/build.cmake:8 (set):
  Syntax error in cmake code at


/home/user/Development/projects/peacock/cmake/package/pcraster_raster_format/1.3.1/build.cmake:25

  when parsing string

    1i \

  if(CMAKE_C_COMPILER_ID STREQUAL \"GNU\")\\n\

      add_compile_options(\"-fPIC\")\\n\

  endif()

  syntax error, unexpected cal_SYMBOL, expecting $end (38)
Call Stack (most recent call first):
  cmake/PeacockBuild.cmake:7 (include)
  cmake/Peacock.cmake:11 (include)
  CMakeLists.txt:13 (include)