Restore compatibility with haxe prior to 4.1

Author: FlorianB-playdigious

hscript/Interp.hx

@@ -657,6 +657,8 @@ class Interp {
 			isAllObject = isAllObject && Reflect.isObject(key);
 			isAllEnum = isAllEnum && Reflect.isEnumValue(key);
 		}
+		
+		#if (haxe_ver >= 4.1)
 		if( isAllInt ) {
 			var m = new Map<Int,Dynamic>();
 			for( i => key in keys )
@@ -681,6 +683,20 @@ class Interp {
 				m.set(key, values[i]);
 			return m;
 		}
+		#else
+		var m:Dynamic = {
+			if ( isAllInt ) new haxe.ds.IntMap<Dynamic>();
+			else if ( isAllString ) new haxe.ds.StringMap<Dynamic>();
+			else if ( isAllEnum ) new haxe.ds.EnumValueMap<Dynamic, Dynamic>();
+			else if ( isAllObject ) new haxe.ds.ObjectMap<Dynamic, Dynamic>();
+			else null;
+		}
+		if( m != null ) {
+			for ( n in 0...keys.length )
+				setMapValue(m, keys[n], values[n]);
+			return m;
+		}
+		#end
 		error(ECustom("Invalid map keys "+keys));
 		return null;
 	}