Make sudo pass -Wmissing-prototypes

plugins/python/python_plugin_common.c

@@ -42,7 +42,7 @@ static size_t python_inittab_copy_len = 0;
 # define Py_FinalizeEx()	(Py_Finalize(), 0)
 #endif
 
-const char *
+static const char *
 _lookup_value(char * const keyvalues[], const char *key)
 {
     debug_decl(_lookup_value, PYTHON_DEBUG_INTERNAL);
@@ -190,7 +190,7 @@ _restore_inittab(void)
     debug_return;
 }
 
-void
+static void
 python_plugin_handle_plugin_error_exception(PyObject **py_result, struct PluginContext *plugin_ctx)
 {
     debug_decl(python_plugin_handle_plugin_error_exception, PYTHON_DEBUG_INTERNAL);
@@ -396,7 +396,7 @@ _python_plugin_register_plugin_in_py_ctx(void)
     debug_return_int(SUDO_RC_OK);
 }
 
-int
+static int
 _python_plugin_set_path(struct PluginContext *plugin_ctx, const char *path)
 {
     if (path == NULL) {