test: fix windows build

Broken by e7173dfd

Fix by simply disabling the relevant tests.

* bug248 and bug345 require errchk, but we can't
  rely on perl being available.
* bug369 is disabled anyway.

Change-Id: Idf73ebccb066943e3fe17c2f662b37238ec74dfe
Reviewed-on: https://go-review.googlesource.com/2052Reviewed-by: Alex Brainman <alex.brainman@gmail.com>

test/fixedbugs/bug248.go

-// +build !nacl
+// +build !nacl,!windows
 // run
 
 // Copyright 2009 The Go Authors. All rights reserved.
@@ -19,6 +19,7 @@ func main() {
 	a, err := build.ArchChar(build.Default.GOARCH)
 	check(err)
 
+	// TODO: If we get rid of errchk, re-enable this test on Windows.
 	errchk, err := filepath.Abs("errchk")
 	check(err)
 

test/fixedbugs/bug345.go

-// +build !nacl
+// +build !nacl,!windows
 // run
 
 // Copyright 2011 The Go Authors.  All rights reserved.
@@ -19,6 +19,7 @@ func main() {
 	a, err := build.ArchChar(build.Default.GOARCH)
 	check(err)
 
+	// TODO: If we get rid of errchk, re-enable this test on Windows.
 	errchk, err := filepath.Abs("errchk")
 	check(err)
 

test/fixedbugs/bug369.go

-// +build !nacl
+// +build !nacl,!windows
 // run
 
 // Copyright 2011 The Go Authors.  All rights reserved.