bug#8931: url-http-create-request needs extra CRLF for https

[Christopher J. White]

There is a tug of war going on here.  

Prior to 100681, the code had no CRLF after url-http-data.  Mark
Hershberger submitted a patch to add the CRLF because without it, POSTs
with content to https urls just hang:

  http://bzr.savannah.gnu.org/lh/emacs/trunk/revision/100681

This change was undone by Nicola Avrutin in 104908:

  http://bzr.savannah.gnu.org/lh/emacs/trunk/revision/104908

The problem was that with no url-http-data, the request ends with a
double CRLF, which apparently confuses some servers.

I recently came across the exact same problem (with url-http.el
without the extra CRL), and Mark's patch above works just fine for me
(also POSTs to https).

I'm thinking the correct solution is to only add the CRLF if there is
http-data:

-    url-http-data))
+    url-http-data (if url-http-data "\r\n")))

...cj