Test placement_new.cpp failed in clang on Windows

Hi,
I found that test [placement_new.cpp](https://github.com/boostorg/ublas/tree/master/test/placement_new.cpp) failed in clang on Windows.
I got 253 as the return value of the exetuable file after running following compiling command.
```
ksh-3.2$ clang placement_new.cpp -o placement_new.exe -std=c++17 -D_CRT_USE_BUILTIN_OFFSETOF -DBOOST_ALL_NO_LIB=1 -DBOOST_UBLAS_NO_EXCEPTIONS -I"..\..\..\.."
ksh-3.2$ ./placement_new.exe
0,0
ksh-3.2$ echo $?
253
```
We can know that this is because macro `BOOST_UBLAS_USEFUL_ARRAY_PLACEMENT_NEW` is not defined, but the value of `array_new_offset` is 0.
In addition, this test also failed in clang-cl like below but passed in cl on Windows.
So, is this an issue in the boost code or an bug in the clang compiler?
```
ksh-3.2$ cl placement_new.cpp -o placement_new.exe /std:c++17 -D_CRT_USE_BUILTIN_OFFSETOF -DBOOST_ALL_NO_LIB=1 -DBOOST_UBLAS_NO_EXCEPTIONS -I"..\..\..\.."
Microsoft (R) C/C++ Optimizing Compiler Version 19.22.27905 for x64
Copyright (C) Microsoft Corporation. All rights reserved.

cl : Command line warning D9035 : option 'o' has been deprecated and will be removed in a future release
placement_new.cpp
placement_new.cpp: warning C4117: macro name '_CRT_USE_BUILTIN_OFFSETOF' is reserved, '#define' ignored
c:/Program files (x86)/Microsoft Visual Studio/2019/Professional/VC/Tools/MSVC/14.22.27905/include\ostream(257): warning C4530: C++ exception handler used, but unwind semantics are not enabled. Specify /EHsc
c:/Program files (x86)/Microsoft Visual Studio/2019/Professional/VC/Tools/MSVC/14.22.27905/include\ostream(248): note: while compiling class template member function 'std::basic_ostream> &std::basic_ostream>::operator <<(int)'
placement_new.cpp(43): note: see reference to function template instantiation 'std::basic_ostream> &std::basic_ostream>::operator <<(int)' being compiled
placement_new.cpp(43): note: see reference to class template instantiation 'std::basic_ostream>' being compiled
Microsoft (R) Incremental Linker Version 14.22.27905.0
Copyright (C) Microsoft Corporation. All rights reserved.

/out:placement_new.exe
/out:placement_new.exe
placement_new.obj
ksh-3.2$ ./placement_new.exe
0,8
ksh-3.2$ echo $?
0
```