Change Details

``` graphics/libspng: Update to 0.7.1 While here, take maintainership. Approved by: tbd (mentor) Differential Revision: tbd ```

``` graphics/libspng: Update to 0.7.1 While here, take maintainership. Reported by: portscout Approved by: tbd (mentor) Differential Revision: https://reviews.freebsd.org/D33418 ```

``` graphics/libspng: Update to 0.7.1 While here, take maintainership. Reported by: portscout Approved by: tbd (mentor) Differential Revision: tbdhttps://reviews.freebsd.org/D33418 ```