app-office/gnucash: disable semantic interposition

[ProjectMoon]

Issue: #874

Error during build is:

/var/tmp/portage/app-office/gnucash-4.12-r1/work/gnucash-4.12/libgnucash/engine/qofid.cpp:301:19: error: storing the address of local variable ‘value’ in ‘*(QofCollection*)user_data.QofCollection_s::data’ [-Werror=dangling-pointer=]
  301 |         col->data = user_data;
      |         ~~~~~~~~~~^~~~~~~~~~~
/var/tmp/portage/app-office/gnucash-4.12-r1/work/gnucash-4.12/libgnucash/engine/qofid.cpp: In function ‘void collection_compare_cb(QofInstance*, gpointer)’:
/var/tmp/portage/app-office/gnucash-4.12-r1/work/gnucash-4.12/libgnucash/engine/qofid.cpp:144:10: note: ‘value’ declared here
  144 |     gint value;
      |          ^~~~~
/var/tmp/portage/app-office/gnucash-4.12-r1/work/gnucash-4.12/libgnucash/engine/qofid.cpp:144:10: note: ‘user_data’ declared here