Don't bail out on :package-version in `defcustom'

I'm (once again ...) porting clojure-mode, and needed this patch.

2014-09-27  Michael Sperber  <[email protected]>

	* custom.el (defcustom): 
	(custom-handle-keyword): Handle :package-version without bailing out.

Will push Monday if nobody objects.

-- 
Regards,
Mike

diff --git a/lisp/custom.el b/lisp/custom.el
--- a/lisp/custom.el
+++ b/lisp/custom.el
@@ -274,6 +274,15 @@
         VALUE should be a string specifying that the variable was
         first introduced, or its default value was changed, in Emacs
         version VERSION.
+:package-version
+        VALUE should be a list with the form (PACKAGE . VERSION)
+        specifying that the variable was first introduced, or its
+        default value was changed, in PACKAGE version VERSION.  This
+        keyword takes priority over :version.  The PACKAGE and VERSION
+        must appear in the alist `customize-package-emacs-version-alist'.
+        Since PACKAGE must be unique and the user might see it in an
+        error message, a good choice is the official name of the
+        package, such as MH-E or Gnus.
 :tag LABEL
         Use LABEL, a string, instead of the item's name, to label the item
         in customization menus and buffers.
@@ -458,6 +467,8 @@
 	 (custom-add-to-group value symbol type))
 	((eq keyword :version)
 	 (custom-add-version symbol value))
+	((eq keyword :package-version)
+	 (custom-add-package-version symbol value))
 	((eq keyword :link)
 	 (custom-add-link symbol value))
 	((eq keyword :load)
@@ -507,6 +518,10 @@
   "To the custom option SYMBOL add the version VERSION."
   (put symbol 'custom-version version))
 
+(defun custom-add-package-version (symbol version)
+  "To the custom option SYMBOL add the package version VERSION."
+  (put symbol 'custom-package-version version))
+
 (defun custom-add-load (symbol load)
   "To the custom option SYMBOL add the dependency LOAD.
 LOAD should be either a library file name, or a feature name."

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