evil-ex-make-pattern: Don't transform the word boundaries into vim-style

[twlz0ne]

If very magic is enabled, the "\\_<pattern\\_>" will be transformed into "\\_\\<pattern\\_\\>":

Minimal configuration to reproduce:

emacs -Q -L ~/repos/emacs-evil --eval "
  (progn
    (toggle-debug-on-error)
    (require 'evil)
    (setq evil-magic 'very-magic)
    (setq evil-ex-search-vim-style-regexp t)
    (evil-select-search-module 'evil-search-module 'evil-search)
    (evil-mode 1)
    (with-current-buffer \"*scratch*\"
      (erase-buffer)
      (insert \"foo bar\nfoo bar\nfoo bar\nfoo bar\nfoo bar\nfoo bar\n\")
      (insert \"\nReproduce: \n\n  Press / and RET to repeat the last search.\")
      (goto-char (point-min))
      (evil-ex-start-word-search nil 'forward 1 t)
      (evil-ex-nohighlight)))
  " -nw

[tomdl89]

@twlz0ne thanks for the PR. I still get an (albeit different) error when I run your minimum repro after pulling your branch:

(search-failed "\\<foo\\>")

Am I missing something, or does need a little more work?

[twlz0ne]

@tomdl89 Sorry for not doing enough testing within the minimal configuration. I will update the PR tomorrow or later.

[twlz0ne]

@tomdl89 Updated. Now it's working for "\\<pattern\\>".

[tomdl89]

@twlz0ne I reverted a part of this PR here: 6e22e2b
by removing the ? quantifier from the _ tokens, as it was breaking very-magic's ability to search for literal (escaped) < and > tokens. I realise I may have inadvertently broken something, so please let me know if so, and I can look at a more comprehensive fix.