[java/cs] Add --feature-level command-line option. Requires the latest hxjava/hxcs

gencs.ml

@@ -3000,7 +3000,7 @@ let configure gen =
 	if ( not (Common.defined gen.gcon Define.NoCompilation || Common.defined gen.gcon Define.UnityStdTarget) ) then begin
 		let old_dir = Sys.getcwd() in
 		Sys.chdir gen.gcon.file;
-		let cmd = "haxelib run hxcs hxcs_build.txt --haxe-version " ^ (string_of_int gen.gcon.version) in
+		let cmd = "haxelib run hxcs hxcs_build.txt --haxe-version " ^ (string_of_int gen.gcon.version) ^ " --feature-level 1" in
 		print_endline cmd;
 		if gen.gcon.run_command cmd <> 0 then failwith "Build failed";
 		Sys.chdir old_dir;

genjava.ml

@@ -2323,7 +2323,7 @@ let configure gen =
 	if ( not (Common.defined gen.gcon Define.NoCompilation) ) then begin
 		let old_dir = Sys.getcwd() in
 		Sys.chdir gen.gcon.file;
-		let cmd = "haxelib run hxjava hxjava_build.txt --haxe-version " ^ (string_of_int gen.gcon.version) in
+		let cmd = "haxelib run hxjava hxjava_build.txt --haxe-version " ^ (string_of_int gen.gcon.version) ^ " --feature-level 1" in
 		print_endline cmd;
 		if gen.gcon.run_command cmd <> 0 then failwith "Build failed";
 		Sys.chdir old_dir;