cmake: Remove ENABLE_PANDORA option

Pretty much all of the code for supporting OpenPandora is gone from the
source tree, and the last two mentions have just been slated for
removal, so it's effectively dead.

CMakeLists.txt

@@ -53,7 +53,6 @@ option(ENABLE_TESTS "Build unit tests")
 option(ENABLE_NLS "Enable building of translations" ON)
 option(ENABLE_LOW_MEM "Reduce memory usage by removing extra functionality" OFF)
 option(ENABLE_OMP "Enables OpenMP, and has additional dependencies" OFF)
-option(ENABLE_PANDORA "Add support for the OpenPandora by adding support for the resolution of 800x480 and switching to a special theme" OFF)
 option(ENABLE_SDL_GPU "Enable building with SDL_gpu (experimental)" OFF)
 option(ENABLE_LIBPNG "Enable support for writing png files (screenshots, images)" ON)
 option(ENABLE_LIBINTL "Enable using libintl for translations instead of Boost.Locale library (not recommended)" OFF)
@@ -539,10 +538,6 @@ if(ENABLE_LOW_MEM)
 	add_definitions(-DLOW_MEM)
 endif(ENABLE_LOW_MEM)
 
-if(ENABLE_PANDORA)
-	add_definitions(-DPANDORA)
-endif(ENABLE_PANDORA)
-
 if(ENABLE_OMP)
 	find_package(OpenMP REQUIRED)
 	set(CMAKE_C_FLAGS "${OpenMP_C_FLAGS} ${CMAKE_C_FLAGS}")