[9front] url query params in rc-httpd

["Dave MacFarlane" <driusan@driusan.net>]

There's a bug in rc-httpd when a query param has something that
looks like a url in it, it handles it as a request for the queryparam,
not a request for the url being requested. 

ie. a request for https://example.com/foo?q=http://example.com/bar is treated
as a request for http://example.com/bar by rc-httpd. I'm not sure if this 
is the right fix, but I worked around it by stripping everything after the '?'
from the $REQUEST_URI before doing the check for if it's an http proxy request.

diff 9c2e8e2b13b0d01b7adf88b61af6edfbddd872c1 uncommitted
--- a/rc/bin/rc-httpd/rc-httpd
+++ b/rc/bin/rc-httpd/rc-httpd
@@ -64,7 +64,8 @@
 		~ $line(2) chunked && chunked=yes
 	}
 }
-if(~ $REQUEST_URI *://* //*){
+REQUEST_NP=`{echo $REQUEST_URI | sed 's;\?.*;;'}
+if(~ $REQUEST_NP *://* //*){
 	SERVER_NAME=`{echo $REQUEST_URI | sed '
 		s;^[^:]+:;;
 		s;^//([^/]+).*;\1;'}