remove trailing slashes on FileSystem.exists (closes #2577)

std/cpp/_std/sys/FileSystem.hx

@@ -31,7 +31,7 @@ private enum FileKind {
 class FileSystem {
 
 	public static inline function exists( path : String ) : Bool {
-		return sys_exists(path);
+		return sys_exists(haxe.io.Path.removeTrailingSlashes(path));
 	}
 
 	public static function rename( path : String, newPath : String ) : Void {

std/neko/_std/sys/FileSystem.hx

@@ -31,7 +31,7 @@ private enum FileKind {
 class FileSystem {
 
 	public static function exists( path : String ) : Bool {
-		return sys_exists(untyped path.__s);
+		return sys_exists(untyped (haxe.io.Path.removeTrailingSlashes(path)).__s);
 	}
 
 	public static function rename( path : String, newPath : String ) : Void {