Include includes.h for HAVE_GETPAGESIZE.

The configure script checks for getpagesize() and sets HAVE_GETPAGESIZE in
config.h, but bsd-getpagesize.c forgot to include includes.h (which
indirectly includes config.h) so the checks always fails, causing linker
issues when linking statically on systems with getpagesize().

Patch from Peter Korsgaard <peter at korsgaard.com>

openbsd-compat/bsd-getpagesize.c

@@ -1,5 +1,7 @@
 /* Placed in the public domain */
 
+#include "includes.h"
+
 #ifndef HAVE_GETPAGESIZE
 
 #include <unistd.h>