Bug#1138377: Patch to fix restinio FTBFS with openssl 4.0

[Michał Makowski]

This patch from upstream should apply onto version 0.6.19+ds-1.2, fixing the build: https://github.com/Stiffstream/restinio/commit/0289da2d5a9ed6907cd630f2cbe199d7f3ad7aa4.