Remove another vestige of org-mtags

* lisp/org-src.el (org-edit-src-find-region-and-lang): Remove old
<foo>-style tags.

This completes commit 94939bd

lisp/org-src.el

@@ -557,13 +557,6 @@ the language, a switch telling if the content should be in a single line."
 	 (append
 	  org-edit-src-region-extra
 	  '(
-	    ("<src\\>[^<]*>[ \t]*\n?" "\n?[ \t]*</src>" lang)
-	    ("<literal\\>[^<]*>[ \t]*\n?" "\n?[ \t]*</literal>" style)
-	    ("<example>[ \t]*\n?" "\n?[ \t]*</example>" "fundamental")
-	    ("<lisp>[ \t]*\n?" "\n?[ \t]*</lisp>" "emacs-lisp")
-	    ("<perl>[ \t]*\n?" "\n?[ \t]*</perl>" "perl")
-	    ("<python>[ \t]*\n?" "\n?[ \t]*</python>" "python")
-	    ("<ruby>[ \t]*\n?" "\n?[ \t]*</ruby>" "ruby")
 	    ("^[ \t]*#\\+begin_src\\( \\([^ \t\n]+\\)\\)?.*\n" "\n[ \t]*#\\+end_src" 2)
 	    ("^[ \t]*#\\+begin_example.*\n" "\n[ \t]*#\\+end_example" "fundamental")
 	    ("^[ \t]*#\\+html:" "\n" "html" single-line)