Eliminate create-solarized-theme macro

This was a remnant from having separate solarized-dark and -light themes. We
only ever produce one theme now, so use the usual theme definition mechanism.

solarized-definitions.el

@@ -823,29 +823,5 @@ contains Solarized symbols."
                 ;; haskell
                 (haskell-keyword-face (,@fg-cyan)))))))
 
-;;;###autoload
-(when (boundp 'custom-theme-load-path)
-  (add-to-list 'custom-theme-load-path
-               (file-name-as-directory (file-name-directory load-file-name))))
-
-(defmacro create-solarized-theme (name description color-definitions)
-  "Define the theme from the provided pieces.
-NAME is a bare symbol, DESCRIPTION is the text that will be presented to users,
-and COLOR-DEFINITIONS is the list of face-specs that comprise the theme."
-  `(let ((name ,name)
-         (description ,description)
-         (color-definitions ,color-definitions))
-     (custom-declare-theme name (custom-make-theme-feature name) description)
-     (apply #'custom-theme-set-faces name color-definitions)
-     (custom-theme-set-variables
-      name
-      ;; This is obsolete, but something might still be referencing it.
-      '(ansi-color-names-vector
-        ,(apply #'vector
-                (mapcar (lambda (color-name)
-                          (nth 1 (assoc color-name solarized-colors)))
-                        '(base02 red green yellow blue magenta cyan base2)))))
-     (provide-theme name)))
-
 (provide 'solarized-definitions)
 ;;; solarized-definitions.el ends here

solarized-theme.el

@@ -1,12 +1,21 @@
-;; -*- lexical-binding: t; -*-
+;; solarized-theme.el --- Solarized custom theme  -*- lexical-binding: t; -*-
 
 (require 'solarized-definitions
          (locate-file "solarized-definitions.el" custom-theme-load-path
                       '("c" "")))
 
-(create-solarized-theme 'solarized
-                        solarized-description
-                        (solarized-color-definitions))
+(deftheme solarized solarized-description)
+
+(apply #'custom-theme-set-faces 'solarized (solarized-color-definitions))
+
+(custom-theme-set-variables
+ 'solarized
+ ;; This is obsolete, but something might still be referencing it.
+ `(ansi-color-names-vector
+   ,(apply #'vector
+           (mapcar (lambda (color-name)
+                     (nth 1 (assoc color-name solarized-colors)))
+                   '(base02 red green yellow blue magenta cyan base2)))))
 
 (cl-defun solarized-update-background-mode
     (appearance &optional (frames (frame-list)))
@@ -31,3 +40,11 @@ that observes the background characteristic."
                     ('dark 'light)
                     (_ 'dark))))
     (solarized-update-background-mode new-mode)))
+
+;;;###autoload
+(when load-file-name
+  (add-to-list 'custom-theme-load-path
+               (file-name-as-directory (file-name-directory load-file-name))))
+
+(provide-theme 'solarized)
+;;; solarized-theme.el ends here