Add missing _get_type() functions of all mocked GObject classes

If a GObject is replaced by a mock up, its _get_type() function has to
be replaced as well. The replaced _get_type() functions have to return
the type of the mock up now.

libgnucash/engine/mocks/gmock-Account.cpp

@@ -23,6 +23,12 @@ gnc_mockaccount_class_init(MockAccountClass *klass)
     // function is unused, class functions are defined in C++ code
 }
 
+
+GType gnc_account_get_type(void)
+{
+    return gnc_mockaccount_get_type();
+}
+
 void
 xaccAccountBeginEdit (Account *account)
 {

libgnucash/engine/mocks/gmock-Split.cpp

@@ -27,6 +27,11 @@ gnc_mocksplit_class_init (MockSplitClass *klass)
 }
 
 
+GType gnc_split_get_type(void)
+{
+    return gnc_mocksplit_get_type();
+}
+
 Split *
 xaccMallocSplit (QofBook *book)
 {

libgnucash/engine/mocks/gmock-Transaction.cpp

@@ -25,6 +25,11 @@ gnc_mocktransaction_class_init(MockTransactionClass *klass)
 }
 
 
+GType gnc_transaction_get_type(void)
+{
+    return gnc_mocktransaction_get_type();
+}
+
 void
 xaccTransBeginEdit (Transaction *trans)
 {

libgnucash/engine/mocks/gmock-qofbook.cpp

@@ -20,6 +20,12 @@ qof_mockbook_class_init(QofMockBookClass *klass)
     // function is unused, class functions are defined in C++ code
 }
 
+
+GType qof_book_get_type(void)
+{
+    return qof_mockbook_get_type();
+}
+
 gboolean
 qof_book_use_split_action_for_num_field (const QofBook *book)
 {