contrib: Do not pass debug/optim flags to meson

This fixes the meson underscore prefix test, which misbehaves
when -g is passed, as it would detect the debug string without
underscore first and incorrectly report that no underscore
prefix for symbols is used.

Fixes build issues with dav1d, which relies on the underscore
prefix check.

See: https://github.com/mesonbuild/meson/issues/5482
Signed-off-by: Hugo Beauzée-Luyssen <hugo@beauzee.fr>
(cherry picked from commit 3426d7bcf98fee15c239ea2b3d815c613df82efe)
Signed-off-by: Hugo Beauzée-Luyssen <hugo@beauzee.fr>
8 jobs for !2 with fix_meson_builds in 37 minutes and 13 seconds (queued for 1 second)
merge request