gnucash maint: Fix TravisCI build failure.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/59a6ebc3 (commit)
	from  https://github.com/Gnucash/gnucash/commit/0cf42a75 (commit)



commit 59a6ebc33a289de9f35a975feacfc91e09bb54e1
Author: John Ralls <jralls at ceridwen.us>
Date:   Tue Sep 18 15:07:47 2018 -0700

    Fix TravisCI build failure.



Summary of changes:
 common/base-typemaps.i | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)