msvs: Revert r1920 and add a test for excluded idl

test/win/gyptest-midl-excluded.py

Index: test/win/gyptest-midl-excluded.py
diff --git a/test/win/gyptest-ml-safeseh.py b/test/win/gyptest-midl-excluded.py
similarity index 51%
copy from test/win/gyptest-ml-safeseh.py
copy to test/win/gyptest-midl-excluded.py
index ec702b9df2f5fbc7b98dd9d73a4175c8f4ec1d60..70059ab64bede557440a70ab0bbedbf42765a466 100644
--- a/test/win/gyptest-ml-safeseh.py
+++ b/test/win/gyptest-midl-excluded.py
@@ -5,7 +5,7 @@
 # found in the LICENSE file.
 
 """
-Make sure the /safeseh option can be passed to ml.
+Test that .idl files in actions and non-native rules are excluded.
 """
 
 import TestGyp
@@ -13,10 +13,10 @@ import TestGyp
 import sys
 
 if sys.platform == 'win32':
-  test = TestGyp.TestGyp(formats=['ninja'])
+  test = TestGyp.TestGyp(formats=['msvs', 'ninja'])
 
-  CHDIR = 'ml-safeseh'
-  test.run_gyp('ml-safeseh.gyp', chdir=CHDIR)
-  test.build('ml-safeseh.gyp', test.ALL, chdir=CHDIR)
+  CHDIR = 'idl-excluded'
+  test.run_gyp('idl-excluded.gyp', chdir=CHDIR)
+  test.build('idl-excluded.gyp', test.ALL, chdir=CHDIR)
 
   test.pass_test()