[Vala] How to substitude header_free_param_list() with Vala 0.12.x

[Olivier Duchateau <duchateau olivier gmail com>]

Hi,

With Vala >= 0.14.x and libsoup-2.4 there's method, which calls
'header_free_param_list()'. I wonder how I can replace this method
under Vala 0.12.x. I can't see a 'free' method for this old version of
Vala.

I can't upgrade Vala, because it's official version in FreeBSD's ports tree.

Regards

-- 
olivier