Drop obsolete _WIN32 special-casing

These were added in commit 14143435f8
(#87812#, 2001-06-05).
The operators taking std::nothrow_t exist in MSVC now.

Change-Id: I1650b7e4ec0a60af521597bef8d3e00fc500f086
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/194680
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

salhelper/source/simplereferenceobject.cxx

@@ -37,12 +37,7 @@ void *SimpleReferenceObject::operator new(std::size_t nSize)
 void *SimpleReferenceObject::operator new(std::size_t nSize,
                                            std::nothrow_t const &)
 {
-#if defined(_WIN32)
-    return ::operator new(nSize);
-        // WNT lacks a global nothrow operator new...
-#else // _WIN32
     return ::operator new(nSize, std::nothrow);
-#endif // _WIN32
 }
 
 void SimpleReferenceObject::operator delete(void * pPtr)
@@ -52,11 +47,7 @@ void SimpleReferenceObject::operator delete(void * pPtr)
 
 void SimpleReferenceObject::operator delete(void * pPtr, std::nothrow_t const &)
 {
-#if defined(_WIN32)
-    ::operator delete(pPtr); // WNT lacks a global nothrow operator delete...
-#else // _WIN32
     ::operator delete(pPtr, std::nothrow);
-#endif // _WIN32
 }
 
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