x64 handle test failing b/c FindFirstFile handle is not leaked non-det

_From [bruen...@google.com](https://code.google.com/u/109494838902877177630/) on December 29, 2012 20:37:47_

CMake Error at runtest.cmake:547 (message):

```
D:\derek\drmemory\build_suite\build_drmemory-dbg-64/logs/DrMemory-handle.exe.10916.000/results.txt
failed to match "FindFirstFileA"

\~~Dr.M~~ 21 unique, 21 total handle leak(s)

% grep -B 2 FindFirstF build_drmemory-dbg-64/logs/DrMemory-handle.exe.10916.000/r*
```

doesn't repro on a manual re-run:

```
% cd build_drmemory-dbg-64/
% ctest -R handle
Test project D:/derek/drmemory/build_suite/build_drmemory-dbg-64
Start 4: handle
1/1 Test `#4`: handle ........................... Passed 2.45 sec

100% tests passed, 0 tests failed out of 1

Total Test time (real) = 2.46 sec

% grep -B 2 FindFirstF `ls -1td logs/D*|head -1`/r*
\# 0 system call NtOpenFile
\
\# 1 KERNELBASE.dll!FindFirstFileExW (0x000007fefdff501b \)
??:0
\# 2 KERNELBASE.dll!FindFirstFileA (0x000007fefe02e949 \)
```

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=1109_