Use libexec/${DEB_HOST_MULTIARCH} to override --libexecdir

Dylan Aïssirequested to merge
wip/daissi/libexecdir-multi into debian/unstable

Using lib/${DEB_HOST_MULTIARCH} is causing issues with IPA Manager which tries to parse v4l2-compat.so.

https://lists.libcamera.org/pipermail/libcamera-devel/2025-February/048733.html

Signed-off-by: Dylan Aïssi dylan.aissi@collabora.com

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