cmake ALLEGRO_HAVE_DIRENT_H examples

liballeg/allegro5 CMakeLists.txt :503 

check_include_files(dirent.h ALLEGRO_HAVE_DIRENT_H)

adventuregamestudio/ags libsrc/allegro/CMakeLists.txt :39 

check_include_files(dirent.h ALLEGRO_HAVE_DIRENT_H)