* Makefile.in (DLL_IMPORTS): Remove libadvapi32.a.

* autoload.cc: Add all advapi32 entry points.
	* mount.cc (mount_info::init): Read user fstab only if we have a
	username.
	* passwd.cc (pwdgrp::read_passwd): Only use username if we have one.
	* shared.cc (user_info::initialize): Set cb last so as not to override
	planned behaviour in pwdgrp::read_passwd.
	* uinfo.cc (cygheap_user::init): Fetch Windows username from environment
	variable $USERNAME.  Don't set name in cygheap if variable is empty.
	(internal_getlogin): If we still have no username, try GetUserNameW.

winsup/cygwin/shared.cc

@@ -312,7 +312,6 @@ user_info::initialize ()
   spinlock sversion (version, CURR_USER_MAGIC);
   if (!sversion)
     {
-      cb =  sizeof (*user_shared);
       cygpsid sid (cygheap->user.sid ());
       struct passwd *pw = internal_getpwsid (sid);
       /* Correct the user name with what's defined in /etc/passwd before
@@ -320,6 +319,7 @@ user_info::initialize ()
       if (pw)
 	cygheap->user.set_name (pw->pw_name);
       mountinfo.init ();	/* Initialize the mount table.  */
+      cb = sizeof (*user_shared);
     }
   else if (sversion != CURR_USER_MAGIC)
     sversion.multiple_cygwin_problem ("user shared memory version", version,