Add Music Manager's curl 7.21.2 source.

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+<title>curl_unescape man page</title>
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+<p class="level0"><a name="NAME"></a><h2 class="nroffsh">NAME</h2>
+<p class="level0">curl_unescape - URL decodes the given string <a name="SYNOPSIS"></a><h2 class="nroffsh">SYNOPSIS</h2>
+<p class="level0"><span Class="bold">#include &lt;curl/curl.h&gt;</span> 
+<p class="level0"><span Class="bold">char *curl_unescape( char * url , int length  );</span> 
+<p class="level0"><a name="DESCRIPTION"></a><h2 class="nroffsh">DESCRIPTION</h2>
+<p class="level0">Obsolete function. Use <a class="emphasis" href="./curl_easy_unescape.html">curl_easy_unescape(3)</a> instead! 
+<p class="level0">This function will convert the given URL encoded input string to a "plain string" and return that as a new allocated string. All input characters that are URL encoded (%XX where XX is a two-digit hexadecimal number) will be converted to their plain text versions. 
+<p class="level0">If the 'length' argument is set to 0, curl_unescape() will use strlen() on the input 'url' string to find out the size. 
+<p class="level0">You must curl_free() the returned string when you're done with it. <a name="AVAILABILITY"></a><h2 class="nroffsh">AVAILABILITY</h2>
+<p class="level0">Since 7.15.4, <a class="emphasis" href="./curl_easy_unescape.html">curl_easy_unescape(3)</a> should be used. This function will be removed in a future release. <a name="RETURN"></a><h2 class="nroffsh">RETURN VALUE</h2>
+<p class="level0">A pointer to a zero terminated string or NULL if it failed. <a name="SEE"></a><h2 class="nroffsh">SEE ALSO</h2>
+<p class="level0"><span Class="emphasis">curl_easy_escape(3), curl_easy_unescape(3), curl_free(3), RFC 2396</span> <p class="roffit">
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