meson: drop -Wno-foo bug workaround for Meson < 0.46

This was a workaround for a bug in Meson that was fixed in 0.46 [1].

[1] https://github.com/mesonbuild/meson/pull/2284



Fixes: f7b6a8d1 ("meson: bump required version to 0.46")
Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
(cherry picked from commit 3fd0afd5)