CLEANUP: include: tree-wide alphabetical sort of include files

This patch fixes all the leftovers from the include cleanup campaign. There
were not that many (~400 entries in ~150 files) but it was definitely worth
doing it as it revealed a few duplicates.
diff --git a/contrib/modsecurity/spoa.c b/contrib/modsecurity/spoa.c
index 2c0b545..1a6cd90 100644
--- a/contrib/modsecurity/spoa.c
+++ b/contrib/modsecurity/spoa.c
@@ -36,8 +36,8 @@
 #include <event2/event_struct.h>
 #include <event2/thread.h>
 
-#include <haproxy/list.h>
 #include <haproxy/chunk.h>
+#include <haproxy/list.h>
 #include <haproxy/spoe.h>
 
 #include "spoa.h"