Remove hard-wired configuration of latex minted export

* lisp/org-exp.el: (org-export-format-source-code-or-example):
  Remove hard-wired configuration of minted export
  (org-export-latex-minted-with-line-numbers): remove variable

* lisp/org-latex.el: (org-export-latex-minted-with-line-numbers):
  remove variable

lisp/org-exp.el

@@ -2258,8 +2258,6 @@ in the list) and remove property and value from the list in LISTVAR."
 (defvar org-export-latex-listings-langs) ;; defined in org-latex.el
 (defvar org-export-latex-listings-w-names) ;; defined in org-latex.el
 (defvar org-export-latex-minted-langs) ;; defined in org-latex.el
-(defvar org-export-latex-minted-with-line-numbers) ;; defined in org-latex.el
-
 (defun org-export-format-source-code-or-example
   (backend lang code &optional opts indent caption)
   "Format CODE from language LANG and return it formatted for export.
@@ -2426,8 +2424,7 @@ INDENT was the original indentation of the block."
 				     (format "\n%s $\\equiv$ \n"
 					     (replace-regexp-in-string
 					      "_" "\\\\_" caption)))
-				   (format
-				    "\\begin{minted}[mathescape,%s\nnumbersep=5pt,\nframe=lines,\nframesep=2mm]{%s}\n" (if org-export-latex-minted-with-line-numbers "\nlinenos," "") minted-lang)
+				   (format "\\begin{minted}{%s}\n" minted-lang)
 				   rtn "\\end{minted}\n"))))
 			    (t (concat (car org-export-latex-verbatim-wrap)
 				       rtn (cdr org-export-latex-verbatim-wrap))))

lisp/org-latex.el

@@ -453,12 +453,6 @@ pygmentize -L lexers
 	   (symbol :tag "Major mode       ")
 	   (string :tag "Listings language"))))
 
-(defcustom org-export-latex-minted-with-line-numbers nil
-  "Should source code line numbers be included when exporting
-with the latex minted package?"
-  :group 'org-export-latex
-  :type 'boolean)
-
 (defcustom org-export-latex-remove-from-headlines
   '(:todo nil :priority nil :tags nil)
   "A plist of keywords to remove from headlines.  OBSOLETE.