gnucash maint: Fix broken compile of test-gnc-date.c on Ubuntu 14.04.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/cec3f603 (commit)
	from  https://github.com/Gnucash/gnucash/commit/9fa7b7f9 (commit)



commit cec3f6031eb80262346da636e041209981b2bfe1
Author: John Ralls <jralls at ceridwen.us>
Date:   Fri Jan 4 17:01:38 2019 -0800

    Fix broken compile of test-gnc-date.c on Ubuntu 14.04.



Summary of changes:
 libgnucash/engine/test/test-gnc-date.c | 1 +
 1 file changed, 1 insertion(+)