Set the module prefix, updated Windows suffix.

Set the Python module prefix to PYTHON_MODULE_PREFIX, and changed the
suffix on Windows to .pyd as .dll is officially deprecated.

Modules/FindPythonLibs.cmake

@@ -128,6 +128,13 @@ FUNCTION(PYTHON_ADD_MODULE _NAME )
     ADD_LIBRARY(${_NAME} ${PY_MODULE_TYPE} ${ARGN})
 #    TARGET_LINK_LIBRARIES(${_NAME} ${PYTHON_LIBRARIES})
 
+    IF(PYTHON_MODULE_${_NAME}_BUILD_SHARED)
+      SET_TARGET_PROPERTIES(${_NAME} PROPERTIES PREFIX "${PYTHON_MODULE_PREFIX}")
+      IF(WIN32 AND NOT CYGWIN)
+        SET_TARGET_PROPERTIES(${_NAME} PROPERTIES SUFFIX ".pyd")
+      ENDIF(WIN32 AND NOT CYGWIN)
+    ENDIF(PYTHON_MODULE_${_NAME}_BUILD_SHARED)
+
   ENDIF(PYTHON_ENABLE_MODULE_${_NAME})
 ENDFUNCTION(PYTHON_ADD_MODULE)