[all] only apply size preallocation on MD5 for neko, c#, java and C++
[all] only apply size preallocation on MD5 for neko, c#, java and C++

pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe