Boost failed to run libs\python\test on x64 and x86 on release and debug configuration with MSVC on windows

Hi all,

Boost failed to run libs\python\test on x64 and x86 on release and debug configuration with **MSVC** on windows. it can be reproduced on c368e0b on master branch. Could you please help look at this issue?

**Environment:**
VS 2019 + Windows Server 2019

**Repro steps:**

1. git clone https://github.com/boostorg/boost.git F:\gitP
2. cd F:\gitP\boostorg\boost
3. .\bootstrap 2>&1
4. .\b2 headers variant=debug --build-dir=F:\gitP\boostorg\boost\out\amd64rel address-model=64 2>&1
5. .\b2 variant=debug --build-dir=F:\gitP\boostorg\boost\out\amd64rel address-model=64 2>&1
6. set _CL_=/D_SILENCE_EXPERIMENTAL_FILESYSTEM_DEPRECATION_WARNING
7. set OPENSSL_ROOT=F:\tools\OpenSSL\64
8. set path=F:\tools\OpenSSL\64\bin
9. set path=C:\Python\Python27
10. .\b2 -j16 variant=debug --build-dir=F:\gitP\boostorg\boost\out\amd64rel libs\python\test 2>&1

**Error info:**
[boost_test_debug.log](https://github.com/boostorg/boost/files/10193369/boost_test_debug.log)

F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec-dynamic.test\msvc-14.2\debug\python 2.7\threading-multi\exec-dynamic.run
====== BEGIN OUTPUT ======

EXIT STATUS: -1073741819
====== END OUTPUT ======

set Path=C:\Python\Python27;C:\Python\Python27\libs;F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\build\msvc-14.2\debug\python-2.7\threading-multi;%Path%

set status=0
if %status% NEQ 0 (
echo Skipping test execution due to testing.execute=off
exit 0
)
set PYTHONPATH=C:\Python\Python27/Lib;%PYTHONPATH%
"F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec-dynamic.test\msvc-14.2\debug\python-2.7\threading-multi\exec-dynamic.exe" "libs\python\test\exec.py" > "F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec-dynamic.test\msvc-14.2\debug\python-2.7\threading-multi\exec-dynamic.output" 2>&1
set status=%ERRORLEVEL%
echo. >> "F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec-dynamic.test\msvc-14.2\debug\python-2.7\threading-multi\exec-dynamic.output"
echo EXIT STATUS: %status% >> "F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec-dynamic.test\msvc-14.2\debug\python-2.7\threading-multi\exec-dynamic.output"
if %status% EQU 0 (
copy "F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec-dynamic.test\msvc-14.2\debug\python-2.7\threading-multi\exec-dynamic.output" "F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec-dynamic.test\msvc-14.2\debug\python-2.7\threading-multi\exec-dynamic.run"
)
set verbose=0
if %status% NEQ 0 (
set verbose=1
)
if %verbose% EQU 1 (
echo ====== BEGIN OUTPUT ======
type "F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec-dynamic.test\msvc-14.2\debug\python-2.7\threading-multi\exec-dynamic.output"
echo ====== END OUTPUT ======
)
exit %status%

...failed testing.capture-output F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec-dynamic.test\msvc-14.2\debug\python-2.7\threading-multi\exec-dynamic.run...

testing.capture-output F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec.test\msvc-14.2\debug\python-2.7\threading-multi\exec.run
====== BEGIN OUTPUT ======

EXIT STATUS: -1073741819
====== END OUTPUT ======

set Path=C:\Python\Python27;C:\Python\Python27\libs;%Path%

set status=0
if %status% NEQ 0 (
echo Skipping test execution due to testing.execute=off
exit 0
)
set PYTHONPATH=C:\Python\Python27/Lib;%PYTHONPATH%
"F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec.test\msvc-14.2\debug\python-2.7\threading-multi\exec.exe" "libs\python\test\exec.py" > "F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec.test\msvc-14.2\debug\python-2.7\threading-multi\exec.output" 2>&1
set status=%ERRORLEVEL%
echo. >> "F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec.test\msvc-14.2\debug\python-2.7\threading-multi\exec.output"
echo EXIT STATUS: %status% >> "F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec.test\msvc-14.2\debug\python-2.7\threading-multi\exec.output"
if %status% EQU 0 (
copy "F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec.test\msvc-14.2\debug\python-2.7\threading-multi\exec.output" "F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec.test\msvc-14.2\debug\python-2.7\threading-multi\exec.run"
)
set verbose=0
if %status% NEQ 0 (
set verbose=1
)
if %verbose% EQU 1 (
echo ====== BEGIN OUTPUT ======
type "F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec.test\msvc-14.2\debug\python-2.7\threading-multi\exec.output"
echo ====== END OUTPUT ======
)
exit %status%

...failed testing.capture-output F:\gitP\boostorg\boost\out\amd64rel\boost\bin.v2\libs\python\test\exec.test\msvc-14.2\debug\python-2.7\threading-multi\exec.run...

Reproduce the failure from the listed Boost.Python commands, focusing on libs\python\test and the exec.py test cases. Inspect boost_test_debug.log and the failing exec.exe and exec-dynamic.exe runs; done means the Python tests pass for x64 and x86 in both debug and release configurations with MSVC on Windows.

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