Use `split-string' instead of `org-split-string'

Use `split-string' instead of `org-split-string'

* contrib/lisp/org-depend.el (org-depend-trigger-todo):
(org-depend-block-todo):
* contrib/lisp/ox-bibtex.el (org-bibtex-get-arguments):
* contrib/lisp/ox-koma-letter.el (org-koma-letter-template):
* contrib/lisp/ox-taskjuggler.el (org-taskjuggler--build-unique-id):
(org-taskjuggler-resolve-dependencies):
* lisp/ob-core.el (org-babel-insert-result):
* lisp/org-agenda.el (org-search-view):
* lisp/org-lint.el (org-lint-duplicate-target):
(org-lint-wrong-header-value):
* lisp/org.el (org--setup-collect-keywords):
(org-make-org-heading-search-string):
(org-search-radio-target):
(org-local-logging):
(org-entry-add-to-multivalued-property):
(org-entry-remove-from-multivalued-property):
(org-entry-member-in-multivalued-property):
(org-entry-get-multivalued-property):
(org-entry-put-multivalued-property):
(org-wrap):
* lisp/ox-beamer.el (org-beamer-allowed-property-values):
* lisp/ox.el (org-export--get-subtree-options):
(org-export--get-inbuffer-options): Use `split-string' instead of
`org-split-string'.