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.

plugins/python/regress/check_python_examples.c

@@ -24,7 +24,7 @@
 #include "testhelpers.h"
 #include <unistd.h>
 
-#include "sudo_dso.h"
+#include <sudo_dso.h>
 
 #define DECL_PLUGIN(type, variable_name) \
     static struct type *variable_name = NULL; \

plugins/python/regress/iohelpers.h

@@ -26,14 +26,14 @@
 #ifdef HAVE_STDBOOL_H
 # include <stdbool.h>
 #else
-# include "compat/stdbool.h"
+# include <compat/stdbool.h>
 #endif /* HAVE_STDBOOL_H */
 #include <string.h>
 #include <stdarg.h>
 #include <signal.h>
 #include <pwd.h>
 
-#include "sudo_compat.h"
+#include <sudo_compat.h>
 
 #define MAX_OUTPUT (2 << 16)
 

plugins/python/regress/testhelpers.h

@@ -23,7 +23,7 @@
 
 #include "../pyhelpers.h"
 
-#include "sudo_conf.h"
+#include <sudo_conf.h>
 
 // just for the IDE
 #ifndef SRC_DIR