We no longer need to include headers we don't use for sudo*.h files.

Previously we needed to include headers required by the various
sudo*h files.  Now those files are more self-sufficient and we
should only include headers needed by code in the various .c files.

plugins/sudoers/linux_audit.c

@@ -25,7 +25,6 @@
 
 #ifdef HAVE_LINUX_AUDIT
 
-#include <sys/types.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>