Bug with default library type of Python modules.

The _TARGET_SUPPORTS_SHARED_LIBS variable was being altered outside of
the find module, moving it into the function fixes any of these scoping
issues. Fix tested and verified in VTK and Titan.

Modules/FindPythonLibs.cmake

@@ -105,11 +105,9 @@ FIND_PACKAGE_HANDLE_STANDARD_ARGS(PythonLibs DEFAULT_MSG PYTHON_LIBRARIES PYTHON
 # PYTHON_ADD_MODULE(<name> src1 src2 ... srcN) is used to build modules for python.
 # PYTHON_WRITE_MODULES_HEADER(<filename>) writes a header file you can include 
 # in your sources to initialize the static python modules
-
-GET_PROPERTY(_TARGET_SUPPORTS_SHARED_LIBS
-  GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS)
-
 FUNCTION(PYTHON_ADD_MODULE _NAME )
+  GET_PROPERTY(_TARGET_SUPPORTS_SHARED_LIBS
+    GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS)
   OPTION(PYTHON_ENABLE_MODULE_${_NAME} "Add module ${_NAME}" TRUE)
   OPTION(PYTHON_MODULE_${_NAME}_BUILD_SHARED
     "Add module ${_NAME} shared" ${_TARGET_SUPPORTS_SHARED_LIBS})