Ignores `sys` conditional compilation block

[darmie]

hxnodejs would not compile blocks that check if target is sys compatible.

e.g the following code will not work on hxnodejs

#if sys 
Sys.println("Hello Haxe!")
#end

[neimanpinchas]

yes, because hxnodejs is not sync by default because it's not fully compatible

see this link https://github.com/HaxeFoundation/hxnodejs/blob/master/extraParams.hxml

https://community.haxe.org/t/using-sys-in-nodejs-target/3702/3