Merge pull request #28617 from owncloud/stable10-makefile-remove-themes

[stable10] Remove themes folder from Makefile

Author: Vincent Petry

Makefile

@@ -59,7 +59,7 @@ core_vendor=core/vendor
 
 core_doc_files=AUTHORS COPYING README.md
 core_src_files=$(wildcard *.php) index.html db_structure.xml .htaccess .user.ini
-core_src_dirs=apps core l10n lib occ ocs ocs-provider resources settings themes
+core_src_dirs=apps core l10n lib occ ocs ocs-provider resources settings
 core_test_dirs=tests
 core_all_src=$(core_src_files) $(core_src_dirs) $(core_doc_files)
 dist_dir=build/dist