[cs/java] use spliceVoid instead of splice for structure field set/delete to avoid unnecessary array allocation
[cs/java] use spliceVoid instead of splice for structure field set/delete to avoid unnecessary array allocation

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