There is no reason for these functions to be in the header (inlining
won't benefit them one bit).
I put them in the header originally only because of the weird state
SourceS was in back then.
It was only used in one place, which did not use va_list.
Looking at the original issue, my guess was whatever this was meant to
work around was an issue in DevilutionX code at the time.
Anders Jenbo
Gleb Mazovetskiy