R6.6: ElyMark uses ElyTree's Git on every platform

Windows and Linux no longer stage Git or its licenses for ElyMark.
git::own looks beside the app, then beside ElyTree (sibling install
or macOS registration). R6.5 review round 1 passed; R6.6-R6.10 listed.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

packaging/licenses.sh

@@ -88,8 +88,8 @@ case $slug in
     put KaTeX "$katex/fonts/OFL.txt" "$katex/fonts/FONT_NOTICE.txt"
     ;;
 esac
-# ElyTree carries Git; on Windows and Linux ElyMark does too.
-if [ "$slug" = ely-tree ] || { [ "$slug" = ely-mark ] && [ "$(uname)" != Darwin ]; }; then
+# ElyTree carries Git.
+if [ "$slug" = ely-tree ]; then
   case $(uname) in
     MINGW* | MSYS*) put Git "$root/engines/git/LICENSE.txt" ;;
     *) put Git "$root/engines/git-src/COPYING" "$root/engines/git-src/LGPL-2.1" ;;