Remove some obsolete code

projectile.el

@@ -224,8 +224,6 @@ When nil Projectile will consider the current directory the project root."
   :group 'projectile
   :type 'string)
 
-(make-obsolete-variable 'projectile-keymap-prefix "Use (define-key projectile-mode-map (kbd ...) 'projectile-command-map) instead." "2.0.0")
-
 (defcustom projectile-cache-file
   (expand-file-name "projectile.cache" user-emacs-directory)
   "The name of Projectile's cache file."
@@ -1468,9 +1466,6 @@ IGNORED-DIRECTORIES may optionally be provided."
              (projectile-get-sub-projects-files directory vcs)))
      (t (projectile-files-via-ext-command directory (projectile-get-ext-command vcs))))))
 
-(define-obsolete-function-alias 'projectile-dir-files-external 'projectile-dir-files-alien "2.0.0")
-(define-obsolete-function-alias 'projectile-get-repo-files 'projectile-dir-files-alien "2.0.0")
-
 (defun projectile-get-ext-command (vcs)
   "Determine which external command to invoke based on the project's VCS.
 Fallback to a generic command when not in a VCS-controlled project."
@@ -5994,7 +5989,7 @@ If the current buffer does not belong to a project, call `previous-buffer'."
 
 
 ;;; Projectile Minor mode
-(define-obsolete-variable-alias 'projectile-mode-line-lighter 'projectile-mode-line-prefix "0.12.0")
+
 (defcustom projectile-mode-line-prefix
   " Projectile"
   "Mode line lighter prefix for Projectile.