Un-xfail-win32 two tests that should actually work

Author: brson

src/test/run-pass/task-comm-chan-cleanup.rs

@@ -1,4 +1,3 @@
-// xfail-win32 Requires unwinding
 use std;
 import std::comm;
 

src/test/run-pass/task-comm-chan-cleanup2.rs

@@ -1,4 +1,3 @@
-// xfail-win32 Requires unwinding
 use std;
 import std::comm;