bug#16132: Crash on Windows

[Andy Moreton]

Mingw build of emacs from r115506 running on win7 64bit. Emacs displayed
the abort dialog during startup, while desktop mode was restoring
buffers. Attaching a debugger:

Program received signal SIGTRAP, Trace/breakpoint trap.
[Switching to Thread 2828.0x1bec]
0x76fc321a in KERNELBASE!DeleteAce () from C:\Windows\syswow64\KernelBase.dll
(gdb) bt full
#0  0x76fc321a in KERNELBASE!DeleteAce () from 
C:\Windows\syswow64\KernelBase.dll
No symbol table info available.
#1  0x0119de74 in emacs_abort () at ../../src/w32fns.c:8414
        button = <optimized out>
#2  0x010be544 in terminate_due_to_signal (sig=sig@entry=0xb, 
backtrace_limit=backtrace_limit@entry=0x28) at ../../src/emacs.c:378
No locals.
#3  0x010d7d3d in handle_fatal_signal (sig=0xb) at ../../src/sysdep.c:1628
No locals.
#4  deliver_thread_signal (sig=0xb, handler=<optimized out>) at 
../../src/sysdep.c:1602
        handler = 0x10d7bf2 <handle_fatal_signal>
#5  deliver_fatal_thread_signal (sig=0xb) at ../../src/sysdep.c:1640
No locals.
#6  0x010011ea in _gnu_exception_handler@4 ()
No symbol table info available.
#7  0x76c9fffb in KERNEL32!GetQueuedCompletionStatus () from 
C:\Windows\syswow64\kernel32.dll
No symbol table info available.
#8  0x0088ccc8 in ?? ()
No symbol table info available.
#9  0x779474ff in ntdll!AlpcMaxAllowedMessageLength () from 
C:\Windows\SysWOW64\ntdll.dll
No symbol table info available.
#10 0x0088ccc8 in ?? ()
No symbol table info available.
#11 0x77909f45 in ntdll!RtlpNtSetValueKey () from C:\Windows\SysWOW64\ntdll.dll
No symbol table info available.
#12 0x01170d6e in sprintf (__stream=0x0, __format=0x142e320 "Copying raw data 
for %.8s...", __format=0x142e320 "Copying raw data for %.8s...") at 
c:/mingw/bin/../lib/gcc/mingw32/4.7.2/../../../../include/stdio.h:269
        __retval = 0x6
        __local_argv = 0x88ffec ""
#13 0x7efde000 in ?? ()
No symbol table info available.
#14 0x00000000 in ?? ()
No symbol table info available.

Lisp Backtrace:
"file-system-info" (0x88d2dc)
"get-free-disk-space" (0x88d478)
"ls-lisp--insert-directory" (0x88d614)
"apply" (0x88d6ec)
"insert-directory" (0x88d898)
"dired-insert-directory" (0x88da40)
"dired-readin-insert" (0x88dbdc)
"dired-readin" (0x88dd88)
"dired-internal-noselect" (0x88df38)
"dired-noselect" (0x88e0d4)
"dired" (0x88e26c)
"dired-restore-desktop-buffer" (0x88e3f8)
0x68c7020 PVEC_COMPILED
"funcall" (0x88e590)
"desktop-create-buffer" (0x88e850)
"eval-buffer" (0x88ea68)
"load-with-code-conversion" (0x88ec00)
"load" (0x88f1ac)
"desktop-read" (0x88f348)
0x58c4650 PVEC_COMPILED
"run-hooks" (0x88f5c8)
"command-line" (0x88f78c)
"normal-top-level" (0x88f8e0)
(gdb)