graphics/opencv: fix build on powerpc64le
/wrkdirs/usr/ports/graphics/opencv/work/opencv-4.11.0/modules/core/include/opencv2/core/hal/intrin_math.hpp:542:41: error: use of undeclared identifier 'v_ne'
542 | _TpVec32F mask_nan = v_or(mask_inf, v_ne(x, x));
| ^