[CI] Use patch application script to apply the patches.

.gitlab-ci.yml

@@ -12,8 +12,7 @@ before_script:
 # end workaround
 # make sure we can apply the patches
 - git submodule foreach --recursive git reset --hard HEAD
-- ( cd python/loopy && git apply ../../patches/loopy/*.patch )
-- ( cd dune/perftool/vectorclass && git apply ../../../patches/vectorclass/*.patch )
+- patches/apply_patches.sh
 
 git--gcc:
   image: docker.io/hpc2se/perftool-base:git