emacs-w3m can't send post data to the form which has a form with 'enctype=multipart/form'.

[JongKyu Baek <bloomycat@xxxxxxxxxxxxxxx>]

This bug report will be sent to the emacs-w3m development team,
 not to your local site managers!!
Please write in simple English, because the emacs-w3m developers
aren't good at English reading. ;-)

Please describe as succinctly as possible:
	- What happened.
	- What you thought should have happened.
	- Precisely what you were doing at the time.

Please also include any Lisp back-traces that you may have.
================================================================
Dear Bug Team!

When I tried to search at htpp://emacswiki.org/ with 'emms' string, I
expected a search result page.  But emacs-w3m spit out below
messages.

-- start of the message.
eval: Wrong type argument: listp, "----_17295_52863_194798
Content-Disposition: form-data; name=\"search\"

emms
----_17295_52863_194798
Content-Disposition: form-data; name=\"lang\"


----_17295_52863_194798
Content-Disposition: form-data; name=\"dosearch\"

Go!
----_17295_52863_194798--
"

-- end of the message.

Then I tested some examples.  I found out that it happened at
following form with 'enctype="multipart/form-data"'.  Below is html
source of search form at http://emacswiki.org/.

-- start of the form.
<form method="get" action="http://www.emacswiki.org/cgi-bin/wiki"
enctype="multipart/form-data" class="search">
<p>Search: <input type="text" name="search"  size="20" accesskey="f"
/>
Language: <input type="text" name="lang"  size="10" />
<input type="submit"name="dosearch" value="Go!"/></p><div></div>
</form>

-- end of the form.

================================================================

System Info to help track down your bug:
---------------------------------------
emacs-w3m-version
 => "1.4.79"
emacs-version
 => "GNU Emacs 22.0.50.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)\n of 2005-11-30 on hodori"
mule-version
 => "5.0 (SAKAKI)"
system-type
 => gnu/linux
w3m-version
 => "w3m/0.5.1"
w3m-type
 => w3m-m17n
w3m-compile-options
 => ("lang=en" "m17n" "image" "color" "ansi-color" "mouse" "gpm" "menu" "cookie" "ssl" "ssl-verify" "external-uri-loader" "w3mmailer" "nntp" "gopher" "ipv6" "alarm" "mark" "migemo")
w3m-language
 => nil
w3m-command-arguments
 => nil
w3m-command-arguments-alist
 => nil
w3m-command-environment
 => nil
w3m-input-coding-system
 => utf-8
w3m-output-coding-system
 => utf-8
w3m-use-mule-ucs
 => nil