* gnu/packages/patches/gpsbabel-minizip.patch: New file. * gnu/packages/patches/gpsbabel-qstring.patch: New file. * gnu/local.mk (dist_patch_DATA): Update accordingly. * gnu/packages/gps.scm (gpsbabel): Update to 1.5.4, [source]: add two previous patches to fix build, [snippet]: remove "gpsbabel" directory excursion, [arguments]: ditto.