message: quote CMake compiler ID for compatibility with some CMake versions
diff: @@ -360,21 +360,21 @@ macro(ospray_configure_compiler)
  set(OSPRAY_COMPILER_CLANG FALSE)
  set(OSPRAY_COMPILER_MSVC FALSE)
  - if (${CMAKE_CXX_COMPILER_ID} STREQUAL "Intel")
  + if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel")
  set(OSPRAY_COMPILER_ICC TRUE)
  if(WIN32) # icc on Windows behaves like msvc
  include(msvc)
  else()
  include(icc)
  endif()
  - elseif (${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU")
  + elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
  set(OSPRAY_COMPILER_GCC TRUE)
  include(gcc)
  - elseif (${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang" OR
  - ${CMAKE_CXX_COMPILER_ID} STREQUAL "AppleClang")
  + elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" OR
  + "${CMAKE_CXX_COMPILER_ID}" STREQUAL "AppleClang")
  set(OSPRAY_COMPILER_CLANG TRUE)
  include(clang)
  - elseif (${CMAKE_CXX_COMPILER_ID} STREQUAL "MSVC")
  + elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
  set(OSPRAY_COMPILER_MSVC TRUE)
  include(msvc)
  else()
  