* cygheap.h (cygheap_user::winname): New field.

* cygheap.cc (cygheap_user::set_name): Clear winname when name changes.
* uinfo.cc (cygheap_user::env_logsrv): Avoid calculating server when Windows
user == SYSTEM.
(cygheap_user::env_domain): Set winname here too.
(cygheap_user::env_userprofile): Eliminate superfluous tests.
(cygheap_user::env_name): Seed winname by calling env_domain().

winsup/cygwin/cygheap.h

@@ -103,6 +103,7 @@ class cygheap_user
   char  *pdomain;       /* Logon domain of the user */
   char  *homedrive;	/* User's home drive */
   char  *homepath;	/* User's home path */
+  char  *winname;	/* User's name as far as Windows knows it */
   PSID   psid;          /* buffer for user's SID */
   PSID   orig_psid;     /* Remains intact even after impersonation */
   static char homedrive_env_buf[3]; /* Where the HOMEDRIVE environment variable