[thread] [tss_hook.cpp] Suppress MSVC CRT memory leak report

[kbluck]

MSVC CRT memory debugger pedantically complains about
an unreleased singleton allocation. Although the
consensus is that this is a harmless annoyance, it does
cause some concern for MSVC users who don't know what
is happening. Issue discussed in this Boost mailing
list thread:

http://lists.boost.org/boost-users/2005/08/13538.php 

Attached is a patch for tss_hook.cpp, which uses the
function _CrtSetDbgFlag to temporarily turn off heap
allocation tracking for the particular allocation in
question. It should have no effect except on MSVC debug
builds. On my configuration (msvc-8_0) it eliminates
the leak warnings.

[Roland Schwarz]

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I will look into this, since AFAIK Michael Glassford
currently is not available.

[sf-robot]

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This Tracker item was closed automatically by the system. It was
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[Roland Schwarz]

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The issue has been fixed in 1.34 and HEAD, altough
differently than the patch suggests. I cannot see that the
suggested patch is MT safe.