Use angle brackets when including headers that can only be found when

an -I flag is specified.  The files in the compat dir could get away
with double quotes here but I've converted all the source files
to use angle brackets for consistency.

plugins/sudoers/boottime.c

@@ -41,8 +41,8 @@
 # include <sys/sysctl.h>
 #endif
 
-#include "compat.h"
-#include "missing.h"
+#include <compat.h>
+#include <missing.h>
 
 /*
  * Fill in a struct timeval with the time the system booted.