message: Add missing renderdoccmd .h file to sources
  Helpful for IDE project generation from CMake ie. xcode project
diff: -set(sources renderdoccmd.cpp)
  +set(sources
  + renderdoccmd.cpp
  + renderdoccmd.h
  + 3rdparty/cmdline/cmdline.h
  + )
  set(includes PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/3rdparty ${CMAKE_SOURCE_DIR}/renderdoc/api)
  set(libraries PRIVATE renderdoc)
  