add extern "C" wrapper to header files

to be usable from cpp

gnucash/gnome-utils/dialog-account.h

@@ -26,6 +26,10 @@
 
 #include "Account.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* Note: make sure to update the help text for this in prefs.scm if these
  * change!  These macros define the account types for which an auto interest
  * xfer dialog could pop up, if the user's preferences allow it.
@@ -180,6 +184,10 @@ void gnc_account_renumber_create_dialog (GtkWidget *window, Account *account);
 
 void gnc_account_cascade_properties_dialog (GtkWidget *window, Account *account);
 
+#ifdef __cplusplus
+}
+#endif
+
 /** @} */
 /** @} */
 

gnucash/gnome/window-reconcile.h

@@ -27,6 +27,10 @@
 #include "Account.h"
 #include <gtk/gtk.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 
 /** STRUCTS *********************************************************/
 typedef struct _RecnWindow RecnWindow;
@@ -66,4 +70,8 @@ void gnc_ui_reconcile_window_raise (RecnWindow * recnData);
 
 GtkWindow *gnc_ui_reconcile_window_get_window (RecnWindow * recnData);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* WINDOW_RECONCILE_H */