package/libcamera: fix build on sparc v8

Fix build failure with sparc v8 which is raised since commit
bd9b7b09 due to
https://git.linuxtv.org/libcamera.git/commit/?id=a8310248fc26cc1e1b791af5e9394c1d20bee269

Fixes:
 - http://autobuild.buildroot.org/results/d0726b2253f1f3d006e057f3b32c646c4b9b5f7a



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>