Allow cygwin to fail on Appveyor

appveyor.yml

@@ -6,7 +6,7 @@ environment:
   global:
     MAKEJOBS: 2
 
-  matrix:
+matrix:
   - SWIGLANG: csharp
     VSVER: 12
   - SWIGLANG: csharp
@@ -20,8 +20,6 @@ environment:
 #   VSVER: 14
 #   VER: 36
 #   PY3: 3
-  - SWIGLANG: python
-    OSVARIANT: cygwin
   - SWIGLANG: python
     OSVARIANT: mingw
     VER: 27
@@ -31,6 +29,11 @@ environment:
     VER: 37
     PY3: 3
 
+allow_failures:
+#  Currently failing due to not detecting header files/include paths
+  - swiglang: python
+    osvariant: cygwin
+
 install:
 - date /T & time /T
 - ps: >-