[TravisCI] only test spod on Linux for now

tests/RunCi.hx

@@ -538,14 +538,14 @@ class RunCi {
 				case Cs:
 					getCsDependencies();
 
-					switch (ci) {
-						case TravisCI:
+					switch [ci, systemName] {
+						case [TravisCI, "Linux"]:
 							runCommand("haxe", ["compile-cs-travis.hxml"]);
 							runExe("bin/cs/bin/Test-Debug.exe");
 
 							runCommand("haxe", ["compile-cs-unsafe-travis.hxml"]);
 							runExe("bin/cs_unsafe/bin/Test-Debug.exe");
-						case AppVeyor, null:
+						case _:
 							runCommand("haxe", ["compile-cs.hxml"]);
 							runExe("bin/cs/bin/Test-Debug.exe");