For building 3.6.2 RC
Fold at 78 columns.
Properly describe change.
Merge pull request #1976 from jimis/3.6.x

3.6.0 Changelog
Switch to custom byte swapping function.

GCC builtins like __bswap_32 are not portable between versions.
(cherry picked from commit da0c7b14a80baf63666c86254b47ea2b999db5e8)