gnucash master: MinGW doesn't support stoi, use atoi instead.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/4be44045 (commit)
	from  https://github.com/Gnucash/gnucash/commit/9a8ed932 (commit)



commit 4be440457584269335dfcbbee7072fe72f820158
Author: John Ralls <jralls at ceridwen.us>
Date:   Thu Jun 30 14:09:25 2016 -0700

    MinGW doesn't support stoi, use atoi instead.



Summary of changes:
 src/libqof/qof/gnc-datetime.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)