gnu: Add emacs-xml-rpc.

* gnu/packages/emacs-xyz.scm (emacs-xml-rpc): New variable.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>

gnu/packages/emacs-xyz.scm

@@ -11376,6 +11376,33 @@ Org-mode.  It features:
 @end itemize\n")
       (license license:gpl3+))))
 
+(define-public emacs-xml-rpc
+  (let ((commit "8f624f8b964e9145acb504e4457c9510e87dd93c")
+        (revision "1"))
+    (package
+      (name "emacs-xml-rpc")
+      (version (git-version "1.6.12" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/hexmode/xml-rpc-el")
+               (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32
+           "0xa54z52rsfl3n0xgmbycj4zazp8ksgdwcq56swzs6wp72zlalmj"))))
+      (build-system emacs-build-system)
+      (home-page "https://github.com/hexmode/xml-rpc-el")
+      (synopsis "XML-RPC client for Emacs")
+      (description "This package provides an XML-RPC client for Emacs capable
+of both synchronous and asynchronous method calls using the @code{url}
+package's async retrieval functionality.  @file{xml-rpc.el} represents XML-RPC
+datatypes as Lisp values, automatically converting to and from the XML
+datastructures as needed, both for method parameters and return values, making
+using XML-RPC methods fairly transparent to the Lisp code.")
+      (license license:gpl3+))))
+
 (define-public emacs-fish-completion
   (package
     (name "emacs-fish-completion")