various files: remove unneeded refs

LICENSE

include/MacportsLegacySupport.h

include/MacportsLegacyWrappers/sysconf_support.h

include/OpenGL/gliDispatch.h

include/TargetConditionals.h

include/dirent.h

include/net/if.h

include/netdb.h

include/pthread.h

include/pthread_impl.h

include/stdio.h

include/stdlib.h

include/sys/aio.h

include/sys/fcntl.h

include/sys/fsgetpath.h

include/sys/queue.h

include/sys/spawn.h

include/sys/stat.h

include/sys/time.h

include/sys/unistd.h