const-time: ct_memmov_cond: switch to use dual mask approach
* src/const-time.c (_gcry_ct_memmov_cond): Use dual mask + AND/OR instead of single mask + XOR.
Cherry-pick master commit of:
4d3e0e30b98b2acb90acb2792b8327c26824a66f
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>