* environ.cc (env_win32_to_posix_path_list): Declare.

(conv_envvars): Use env_win32_to_posix_path_list rather than
cygwin_win32_to_posix_path_list.
(posify): Translate back to win32 path if errno is EIDRM.
* environ.h: Update copyright.  Define ENV_CVT.
* path.cc (conv_path_list): If converting for the environment and removed an
element set errno to ENV_CVT.
(env_win32_to_posix_path_list): New function.

winsup/cygwin/environ.h

@@ -1,6 +1,6 @@
 /* environ.h: Declarations for environ manipulation
 
-   Copyright 2000, 2001, 2002 Red Hat, Inc.
+   Copyright 2000, 2001, 2002, 2003, 2005, 2006 Red Hat, Inc.
 
 This file is part of Cygwin.
 
@@ -48,3 +48,5 @@ extern "C" char __stdcall **cur_environ ();
 char ** __stdcall build_env (const char * const *envp, char *&envblock,
 			     int &envc, bool need_envblock)
   __attribute__ ((regparm (3)));
+
+#define ENV_CVT -1