The parser in QMakeSourceFileInfo::findDeps() would step over the
closing quote of a string, only to have a for loop then step over the
character just after that closing quote, which was thus never studied;
this could lead to problems in various ways. Fixed that and expanded
findDeps() test to catch regressions.
Task-number: QTBUG-17533
Change-Id: I7dec5222e38fa188495b39376ffee70bc7bbc87f
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
8fd05e6289