Update to 0.7.8

Changes: http://doublecmd.sourceforge.net/mantisbt/changelog_page.php?version_id=49
PR: 217327
Submitted by: Benat Gonzalez Etxepare <bbtruk@users.sourceforge.net> (maintainer)
Approved by: lme (mentor)
Differential Revision: https://reviews.freebsd.org/D9795