Use #include <foo.h> instead of #include "foo.h" in most cases.

We rely on the include path to find many of these headers.  It
especially doesn't make sense to use #include "foo.h" for headers
in the top-level include directory.

lib/util/fatal.c

@@ -32,19 +32,19 @@
 #ifdef HAVE_STDBOOL_H
 # include <stdbool.h>
 #else
-# include "compat/stdbool.h"
+# include <compat/stdbool.h>
 #endif /* HAVE_STDBOOL_H */
 #include <unistd.h>
 #ifndef HAVE_GETADDRINFO
-# include "compat/getaddrinfo.h"
+# include <compat/getaddrinfo.h>
 #endif
 
-#include "sudo_compat.h"
-#include "sudo_fatal.h"
-#include "sudo_gettext.h"
-#include "sudo_queue.h"
-#include "sudo_util.h"
-#include "sudo_plugin.h"
+#include <sudo_compat.h>
+#include <sudo_fatal.h>
+#include <sudo_gettext.h>
+#include <sudo_queue.h>
+#include <sudo_util.h>
+#include <sudo_plugin.h>
 
 struct sudo_fatal_callback {
     SLIST_ENTRY(sudo_fatal_callback) entries;