[xchutils] Add a sha512 sum function
[xchutils] Add a sha512 sum function

Signed-off-by: Chris <93f3b195a4de515d53c63d830b5d81d1ff490fbf@gmail.com>
Signed-off-by: Nicholas Tsirakis <d4881e556e12b6aed341497d9ac2cf24de80e598@gmail.com>

OpenXT/xclibs,OpenXT/xclibs