[xiphos-source] [crosswire/xiphos] ed6730: Fix build errors for minizip (#1004)

[Greg Hellings]

  Branch: refs/heads/master
  Home:   https://github.com/crosswire/xiphos
  Commit: ed6730edfdbb63d44a2575326e0230d3d6598d50
      https://github.com/crosswire/xiphos/commit/ed6730edfdbb63d44a2575326e0230d3d6598d50
  Author: Greg Hellings <greg.hellings at gmail.com>
  Date:   2020-04-17 (Fri, 17 Apr 2020)

  Changed paths:
    M .travis.yml
    M cmake/XiphosDependencies.cmake
    M src/gtk/utilities.c

  Log Message:
  -----------
  Fix build errors for minizip (#1004)

* Fix build errors for minizip

* Remove GSF from build deps