Remove locale_guard.h from ardour/ardour.h header

Add to source files that use LocaleGuard

Results in far less recompiling when pbd/locale_guard.h changes

gtk2_ardour/engine_dialog.cc

@@ -27,6 +27,7 @@
 #include <gtkmm/messagedialog.h>
 
 #include "pbd/error.h"
+#include "pbd/locale_guard.h"
 #include "pbd/xml++.h"
 #include "pbd/unwind.h"
 #include "pbd/failed_constructor.h"

libs/ardour/ardour/ardour.h

@@ -31,7 +31,6 @@
 
 #include "pbd/error.h"
 #include "pbd/failed_constructor.h"
-#include "pbd/locale_guard.h"
 #include "pbd/stateful.h"
 
 #include "ardour/libardour_visibility.h"

libs/ardour/io.cc

@@ -31,6 +31,7 @@
 #include "pbd/replace_all.h"
 #include "pbd/unknown_type.h"
 #include "pbd/enumwriter.h"
+#include "pbd/locale_guard.h"
 #include "pbd/types_convert.h"
 
 #include "ardour/audioengine.h"

libs/ardour/ladspa_plugin.cc

@@ -41,6 +41,7 @@
 
 #include "pbd/compose.h"
 #include "pbd/error.h"
+#include "pbd/locale_guard.h"
 #include "pbd/xml++.h"
 #include "pbd/stacktrace.h"
 

libs/ardour/lv2_plugin.cc

@@ -36,6 +36,7 @@
 #include "pbd/stl_delete.h"
 #include "pbd/compose.h"
 #include "pbd/error.h"
+#include "pbd/locale_guard.h"
 #include "pbd/replace_all.h"
 #include "pbd/xml++.h"
 

libs/ardour/plugin.cc

@@ -40,6 +40,7 @@
 
 #include "pbd/compose.h"
 #include "pbd/error.h"
+#include "pbd/locale_guard.h"
 #include "pbd/xml++.h"
 
 #include "ardour/buffer_set.h"

libs/ardour/route.cc

@@ -30,6 +30,7 @@
 
 #include "pbd/xml++.h"
 #include "pbd/enumwriter.h"
+#include "pbd/locale_guard.h"
 #include "pbd/memento_command.h"
 #include "pbd/stacktrace.h"
 #include "pbd/types_convert.h"

libs/ardour/session_state.cc

@@ -50,6 +50,7 @@
 
 #include <glib.h>
 #include "pbd/gstdio_compat.h"
+#include "pbd/locale_guard.h"
 
 #include <glibmm.h>
 #include <glibmm/threads.h>