Improve conversion of the received mysql value bytes to MYSQL_TIME
Improve conversion of the received mysql value bytes to MYSQL_TIME

Clippy (rightful) complained that we read from a potential unaligned pointer,
which would be undefined behaviour.
The problem is: Clippy continues to complain about this, even if we
use `read_unaligned()` here. This seems to be a clippy bug, see
https://github.com/rust-lang/rust-clippy/issues/2881

sgrif/diesel,diesel-rs/diesel,diesel-rs/diesel,sgrif/diesel