Fix Cygwin support

.gitignore

@@ -5,7 +5,7 @@ cmake_install.cmake
 .DS_Store
 /example/example.so
 /example/example.pyd
-/example/example.dll
+/example/example*.dll
 *.sln
 *.sdf
 *.opensdf

CMakeLists.txt

@@ -61,7 +61,7 @@ function(pybind11_add_module target_name)
   set_target_properties(${target_name} PROPERTIES PREFIX "${PYTHON_MODULE_PREFIX}")
   set_target_properties(${target_name} PROPERTIES SUFFIX "${PYTHON_MODULE_EXTENSION}")
 
-  if(WIN32)
+  if(WIN32 OR CYGWIN)
     # Link against the Python shared library on Windows
     target_link_libraries(${target_name} PRIVATE ${PYTHON_LIBRARIES})
   elseif(APPLE)