Remove Erlang-specific compilation error regexp

The purpose of this regexp is to ensure that, when invoking the Erlang
compiler inside Emacs through M-x compile, any error messages be
turned into links jumping to the right line in the right source file.
However, it seems like this works out of the box in modern Emacsen,
and furthermore, using a non-standard regexp inhibits jumping to a
certain column when this is provided by the compiler.

Author: legoscia

lib/tools/emacs/erlang.el

@@ -483,10 +483,6 @@ function.")
   "*Non-nil means TAB in Erlang mode should always re-indent the current line,
 regardless of where in the line point is when the TAB command is used.")
 
-(defvar erlang-error-regexp-alist
-  '(("^\\([^:( \t\n]+\\)[:(][ \t]*\\([0-9]+\\)[:) \t]" . (1 2)))
-  "*Patterns for matching Erlang errors.")
-
 (defvar erlang-man-inhibit (eq system-type 'windows-nt)
   "Inhibit the creation of the Erlang Manual Pages menu.
 
@@ -1327,7 +1323,6 @@ Other commands:
   (erlang-menu-init)
   (erlang-mode-variables)
   (erlang-check-module-name-init)
-  (erlang-add-compilation-alist erlang-error-regexp-alist)
   (erlang-man-init)
   (erlang-tags-init)
   (erlang-font-lock-init)
@@ -1443,31 +1438,6 @@ Other commands:
   (set (make-local-variable 'outline-level) (lambda () 1))
   (set (make-local-variable 'add-log-current-defun-function)
        'erlang-current-defun))
-
-
-;; Compilation.
-;;
-;; The following code is compatible with the standard package `compilation',
-;; making it possible to go to errors using `erlang-next-error' (or just
-;; `next-error' in Emacs 21).
-;;
-;; The normal `compile' command works of course.  For best result, please
-;; execute `make' with the `-w' flag.
-;;
-;; Please see the variables named `compiling-..' above.
-
-(defun erlang-add-compilation-alist (alist)
-  (require 'compile)
-  (cond ((boundp 'compilation-error-regexp-alist) ; Emacs 19
-	 (while alist
-	   (or (assoc (car (car alist)) compilation-error-regexp-alist)
-	       (setq compilation-error-regexp-alist
-		     (cons (car alist) compilation-error-regexp-alist)))
-	   (setq alist (cdr alist))))
-	((boundp 'compilation-error-regexp)
-	 ;; Emacs 18,  Only one regexp is allowed.
-	 (funcall (symbol-function 'set)
-		  'compilation-error-regexp (car (car alist))))))
 
 (defun erlang-font-lock-init ()
   "Initialize Font Lock for Erlang mode."
@@ -4860,7 +4830,6 @@ The following special commands are available:
     (set (make-local-variable 'compilation-old-error-list) nil))
   ;; Needed when compiling directly from the Erlang shell.
   (setq compilation-last-buffer (current-buffer))
-  (erlang-add-compilation-alist erlang-error-regexp-alist)
   (setq comint-prompt-regexp "^[^>=]*> *")
   (setq comint-eol-on-send t)
   (setq comint-input-ignoredups t)