Update to latest curve25519-donna32
Small tweaks to make curve25519-donna32 compile with our warnings
Put the bug number and correct credits in the changes file for the new curve25519-donna32
Merge branch 'curve25519-donna32' into maint-0.2.4
Merge remote-tracking branch 'origin/maint-0.2.4' into maint-0.2.5
Merge remote-tracking branch 'origin/maint-0.2.5'