modules/gnome: set genmarshal extra_args default to list
Which is what it should have been all along.
@@ -1726,7 +1726,7 @@ class GnomeModule(ExtensionModule):
DEPEND_FILES_KW.evolve(since='0.61.0'),
DEPENDS_KW.evolve(since='0.61.0'),
INSTALL_KW.evolve(name='install_header'),
- KwargInfo('extra_args', ContainerTypeInfo(list, str), listify=True),
+ KwargInfo('extra_args', ContainerTypeInfo(list, str), listify=True, default=[]),
KwargInfo('install_dir', (str, NoneType)),
KwargInfo('internal', (str, NoneType)),
KwargInfo('nostdinc', (str, NoneType)),
