Fixed compatilibilty issues on MSVS.

winbuild/dist/include/unistd.h

@@ -1,11 +1,29 @@
 #pragma once
 
+/* Values for the second argument to access.
+   These may be OR'd together.  */
+#define R_OK    4       /* Test for read permission.  */
+#define W_OK    2       /* Test for write permission.  */
+#define F_OK    0       /* Test for existence.  */
+
 // POSIX open,read,write... deprecated as of VC++ 2005.
 // Use ISO conformant _open,_read,_write instead.
+#define access _access
+#define dup2 _dup2
+#define execve _execve
+#define ftruncate _chsize
+#define unlink _unlink
+#define fileno _fileno
+#define getcwd _getcwd
+#define chdir _chdir
+#define isatty _isatty
+#define lseek _lseek
 #define open _open
 #define write _write
 #define close _close
 #define read _read
 #define snprintf _snprintf
-#define dup _dup
+
-#define dup2 _dup2
+#define STDIN_FILENO  0
+#define STDOUT_FILENO 1
+#define STDERR_FILENO 2