Do not assume output dir is two levels down in no-compile tests

base/bind_unittest.nc

Index: base/bind_unittest.nc
diff --git a/base/bind_unittest.nc b/base/bind_unittest.nc
index 24a345d260ff3f9f30aae7db0776c589f6a4b792..e6b253480873f97009e535a492d1470636b73b4a 100644
--- a/base/bind_unittest.nc
+++ b/base/bind_unittest.nc
@@ -203,7 +203,7 @@ void WontCompile() {
   Closure callback_mismatches_bind_type = Bind(&VoidPolymorphic1<int>);
 }
 
-#elif defined(NCTEST_DISALLOW_CAPTURING_LAMBDA)  // [r"fatal error: implicit instantiation of undefined template 'base::internal::FunctorTraits<\(lambda at ../../base/bind_unittest.nc:[0-9]+:[0-9]+\), void>'"]
+#elif defined(NCTEST_DISALLOW_CAPTURING_LAMBDA)  // [r"fatal error: implicit instantiation of undefined template 'base::internal::FunctorTraits<\(lambda at (\.\./)+base/bind_unittest.nc:[0-9]+:[0-9]+\), void>'"]
 
 void WontCompile() {
   int i = 0;