Fix wat syntax so wasm tests pass (#199)

* wasm testsuite: ignore hidden files in test dir

and report a rejected file. it was picking up vim .swp files

* wasmtests: correct wat syntax in icall.wat

cranelift/wasmtests/icall.wat

@@ -1,7 +1,7 @@
 (module
   (type $ft (func (param f32) (result i32)))
   (func $foo (export "foo") (param i32 f32) (result i32)
-    (call_indirect $ft (get_local 1) (get_local 0))
+    (call_indirect (type $ft) (get_local 1) (get_local 0))
   )
   (table (;0;) 23 23 anyfunc)
 )