fix incorrect folder name for julia-0.6.x

Former-commit-id: ef2c7401e0876f22d2f7762d182cfbcd5a7d9c70

julia-0.6.3/include/julia/dirpath.h

@@ -0,0 +1,20 @@
+// This file is a part of Julia. License is MIT: https://julialang.org/license
+
+#ifndef DIRPATH_H
+#define DIRPATH_H
+
+#ifdef _OS_WINDOWS_
+#define PATHSEPSTRING "\\"
+#define PATHLISTSEPSTRING ";"
+#if defined(_MSC_VER) || defined(_COMPILER_CLANG_)
+#define PATH_MAX MAX_PATH
+#endif
+#else
+#define PATHSEPSTRING "/"
+#define PATHLISTSEPSTRING ":"
+#ifndef PATH_MAX // many platforms don't have a max path, we define one anyways
+#define PATH_MAX 1024
+#endif
+#endif
+
+#endif