Remove subsumed repetitions in regexps

Make regexps smaller and faster by removing terms that are superfluous
by virtue of standing next to another term that matches more.  See
https://lists.gnu.org/archive/html/emacs-devel/2020-01/msg00949.html
for details.

* lisp/bs.el (bs--make-header-match-string):
* lisp/gnus/deuglify.el (gnus-outlook-repair-attribution-block):
* lisp/gnus/message.el (message-subject-trailing-was-ask-regexp)
(message-subject-trailing-was-regexp):
* lisp/informat.el (Info-validate):
* lisp/net/browse-url.el (browse-url-button-regexp):
* lisp/net/rcirc.el (rcirc-url-regexp):
* lisp/org/ob-core.el (org-babel-remove-result):
* lisp/org/ob-fortran.el (org-babel-fortran-ensure-main-wrap):
* lisp/org/org-capture.el (org-capture-set-target-location):
* lisp/org/org-table.el (org-table-expand-lhs-ranges):
* lisp/org/org.el (org-maybe-keyword-time-regexp, org-ts-regexp)
(org-ts-regexp-inactive, org-ts-regexp-both):
* lisp/play/gametree.el (gametree-hack-file-layout):
* lisp/progmodes/cc-mode.el (c-Java-defun-prompt-regexp):
* lisp/progmodes/idlw-shell.el (idlwave-shell-halting-error):
* lisp/progmodes/ruby-mode.el (ruby-mode-set-encoding):
* lisp/progmodes/verilog-mode.el (verilog-error-font-lock-keywords)
(verilog-verilint-off, verilog-case-indent-level)
(verilog-within-translate-off, verilog-start-translate-off)
(verilog-back-to-start-translate-off, verilog-end-translate-off)
(verilog-expand-dirnames):
* lisp/term.el (term-control-seq-regexp):
* lisp/textmodes/reftex-vars.el (featurep):
* lisp/url/url-gw.el (url-open-telnet):
* lisp/vc/ediff-ptch.el (ediff-context-diff-label-regexp):
* lisp/vc/pcvs-parse.el (cvs-parse-status):
* test/src/regex-emacs-tests.el (regex-tests-PCRE):
Remove subsumed repetitions.
* lisp/progmodes/sh-script.el (sh-syntax-propertize-function):
Simplify repetition of a repetition.

lisp/progmodes/ruby-mode.el

@@ -801,7 +801,7 @@ The style of the comment is controlled by `ruby-encoding-magic-comment-style'."
       (let ((coding-system (ruby--detect-encoding)))
         (when coding-system
           (if (looking-at "^#!") (beginning-of-line 2))
-          (cond ((looking-at "\\s *#\\s *.*\\(en\\)?coding\\s *:\\s *\\([-a-z0-9_]*\\)")
+          (cond ((looking-at "\\s *#.*\\(en\\)?coding\\s *:\\s *\\([-a-z0-9_]*\\)")
                  ;; update existing encoding comment if necessary
                  (unless (string= (match-string 2) coding-system)
                    (goto-char (match-beginning 2))