TB Linux WASM fails to build because obsolete gcc

[Julien Nabet]

Hello Christian, Guilhem

Would it be possible to upgrade gcc version on TB 481 (Linux-WASM) ?

Indeed the error is quite explicit:

"configure: error: GCC 7.5.0 is too old, must be at least GCC 12"

(see 
https://ci.libreoffice.org/view/tb%20platform%20status/job/lo_daily_tb_linux_wasm/481/console)

I don't know who's responsible for this one, I didn't find infos about 
this TB in https://wiki.documentfoundation.org/Development/Tinderbox

Julien