Un-xfail more pretty-printing tests

src/test/bench/shootout-binarytrees.rs

@@ -1,5 +1,3 @@
-// xfail-pretty
-
 use std;
 import std::int;
 

src/test/bench/shootout-fannkuchredux.rs

@@ -1,5 +1,3 @@
-// xfail-pretty
-
 // Based on Isaac Gouy's fannkuchredux.csharp
 use std;
 import std::int;

src/test/bench/shootout-pfib.rs

@@ -1,4 +1,3 @@
-// xfail-pretty
 // -*- rust -*-
 
 /*

src/test/run-fail/fmt-fail.rs

@@ -1,5 +1,4 @@
 // xfail-stage0
-// xfail-pretty
 // error-pattern:meh
 use std;
 import std::str;

src/test/run-pass/item-attributes.rs

@@ -1,5 +1,4 @@
 // xfail-stage0
-// xfail-pretty
 
 // These are attributes of the implicit crate. Really this just needs to parse
 // for completeness since .rs files linked from .rc files support this

src/test/run-pass/syntax-extension-fmt.rs

@@ -1,5 +1,3 @@
-// xfail-pretty
-
 use std;
 import std::str;