fixed abspath() to not filter space chars in url. they can be part of a file name.

Reference: /n/sources/patch/applied/parsereq-fix
Date: Mon Jun 26 08:33:47 CES 2006
Signed-off-by: fst@9netics.com

--- /sys/src/libhttpd/parsereq.c	Mon Jun 26 08:32:43 2006
+++ /sys/src/libhttpd/parsereq.c	Mon Jun 26 08:32:41 2006
@@ -213,7 +213,7 @@
 	/*
 	 * remove any really special characters
 	 */
-	for(sp = "`;| "; *sp; sp++){
+	for(sp = "`;|"; *sp; sp++){
 		p = strchr(path, *sp);
 		if(p)
 			*p = 0;