No longer suppress the default Accept: header.

This fixes all those sites that brokenly assume that it's required and thus break when the client doesn't send one (here's looking at you royalmail.com).
libcurl's default Accept header is "*/*", which is semantically equivalent to not sending a header at all (no header implies the client accepts all content types).

svn path=/trunk/netsurf/; revision=4196

content/fetchers/fetch_curl.c

@@ -368,7 +368,6 @@ void * fetch_curl_setup(struct fetch *parent_fetch, const char *url,
 	list = slist;
 
 	/* remove curl default headers */
-	APPEND(fetch->headers, "Accept:");
 	APPEND(fetch->headers, "Pragma:");
 
 	/* when doing a POST libcurl sends Expect: 100-continue" by default