CI: don't rebuild contribs when a non-existing folder changes

There's no extras for Linux, so we don't need to rebuild when anything changes in extra/package.

extras/ci/get-contrib-sha.sh

@@ -34,7 +34,7 @@ case $1 in
         VLC_BUILD_TARGET="extras/package/win32"
         ;;
     debian*)
-        VLC_BUILD_TARGET="extras/package/linux"
+        VLC_BUILD_TARGET=""
         ;;
     ios*|tvos*)
         VLC_BUILD_TARGET="extras/package/apple"

extras/ci/gitlab-ci.yml

@@ -263,7 +263,6 @@ debian-contrib:
         - contrib/*
         - extras/tools/*
         - extras/ci/*
-        - extras/package/linux/*
     script: |
         export NCPU=$(getconf _NPROCESSORS_ONLN)
         echo "Building branch '${CI_COMMIT_BRANCH}' (default: '${CI_DEFAULT_BRANCH}')"