message: fixed build error with nmake
diff: @@ -136,7 +136,7 @@ endif()
  if(WIN32)
  if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
  - add_definitions(/Qpar)
  + add_compile_options(/Qpar)
  elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
  append(OIDN_C_CXX_FLAGS "/Qopenmp-simd")
  endif()
  