gnucash maint: Work around strange struct tm initializer failure.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/4b5ee845 (commit)
	from  https://github.com/Gnucash/gnucash/commit/1c6fca9f (commit)



commit 4b5ee84575ee908c8e7c53e21310052ba238747e
Author: John Ralls <jralls at ceridwen.us>
Date:   Fri Nov 2 13:44:09 2018 -0700

    Work around strange struct tm initializer failure.



Summary of changes:
 libgnucash/engine/test/gtest-gnc-datetime.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)