Class members regression
https://gitlab.gnome.org/GNOME/msitools fails to build since commit 9cbd53b8.
It seems it no longers access the base class fields:
../tools/wixl/wix.vala: In function ‘wixl_wix_component_group_class_init’:
../tools/wixl/wix.vala:262:17: error: ‘WixlWixComponentGroupClass’ {aka ‘struct _WixlWixComponentGroupClass’} has no member named ‘name’
262 | name = "ComponentGroup";
| ^~
#line 262 "../tools/wixl/wix.vala"
- _g_free0 (WIXL_WIX_ELEMENT_CLASS (klass)->name);
+ _g_free0 (klass->name);