Fix m00000.vtc to use the right macro

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@5197 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishtest/tests/m00000.vtc

@@ -8,7 +8,7 @@ server s1 {
 } -start
 
 varnish v1 -vcl+backend {
-	import std from "${topsrc}/lib/libvmod_std/.libs/libvmod_std.so.1" ;
+	import std from "${topbuild}/lib/libvmod_std/.libs/libvmod_std.so.1" ;
 
 	sub vcl_deliver {
 		set resp.http.foo = std.toupper(resp.http.foo);