fix clang compilation

error: call to function 'operator>>' that is neither
visible in the template definition nor found by argument-dependent lookup. 'operator>>' should be declared prior to the call site.

IOW. types.h must be included before using ‘ss >> (T) value’ in
template in pbd/configuration.h

gtk2_ardour/option_editor.cc

@@ -22,6 +22,7 @@
 #include <gtkmm/alignment.h>
 #include "gtkmm2ext/utils.h"
 
+#include "ardour/types.h"
 #include "pbd/configuration.h"
 
 #include "ardour/rc_configuration.h"

libs/ardour/ardour/rc_configuration.h

@@ -23,10 +23,10 @@
 #include <map>
 #include <string>
 
+#include "ardour/types.h"
 #include "pbd/configuration.h"
 
 #include "ardour/libardour_visibility.h"
-#include "ardour/types.h"
 #include "ardour/utils.h"
 
 class XMLNode;