dll: fuse: ENOSYS has different values on Windows vs Cygwin

src/dll/fuse/fuse.c

@@ -383,7 +383,7 @@ static NTSTATUS fsp_fuse_svcstart(FSP_SERVICE *Service, ULONG argc, PWSTR *argv)
 
         /* this should always fail with ENOSYS or EINVAL */
         err = f->ops.readlink("/", buf, sizeof buf);
-        f->has_symlinks = -ENOSYS != err;
+        f->has_symlinks = -enosys(f->env) != err;
     }
 
     /* the FSD does not currently limit these VolumeParams fields; do so here! */

src/dll/fuse/library.h

@@ -19,6 +19,7 @@
 #define WINFSP_DLL_FUSE_LIBRARY_H_INCLUDED
 
 #include <dll/library.h>
+#include <dll/fuse/shared.h>
 #include <fuse/fuse.h>
 #include <fuse/fuse_opt.h>
 

src/dll/fuse/shared.h

@@ -0,0 +1,23 @@
+/**
+ * @file dll/fuse/shared.h
+ *
+ * @copyright 2015-2018 Bill Zissimopoulos
+ */
+/*
+ * This file is part of WinFsp.
+ *
+ * You can redistribute it and/or modify it under the terms of the GNU
+ * General Public License version 3 as published by the Free Software
+ * Foundation.
+ *
+ * Licensees holding a valid commercial license may use this file in
+ * accordance with the commercial license agreement provided with the
+ * software.
+ */
+
+#ifndef WINFSP_DLL_FUSE_SHARED_H_INCLUDED
+#define WINFSP_DLL_FUSE_SHARED_H_INCLUDED
+
+#define enosys(env)                     ('C' == (env)->environment ? 88 : 40)
+
+#endif

src/dll/fuse3/library.h

@@ -19,6 +19,7 @@
 #define WINFSP_DLL_FUSE3_LIBRARY_H_INCLUDED
 
 #include <dll/library.h>
+#include <dll/fuse/shared.h>
 #include <fuse/fuse.h>
 #undef FUSE_H_
 #undef FUSE_COMMON_H_