open on paths starting with // fails on win32

syscall.c

@@ -84,6 +84,9 @@ int do_open(char *pathname, int flags, mode_t mode)
 	/* for Windows */
 	flags |= O_BINARY;
 #endif
+	/* some systems can't handle a double / */
+	if (pathname[0] == '/' && pathname[1] == '/') pathname++;
+
 	return open(pathname, flags, mode);
 }