Drop MSVC special-casing for OWeakObject ctor

It was introduced in commit 0c38ca4412
    author	Daniel Boelzle <dbo@openoffice.org>
    date	Mon Nov 18 08:59:15 2002 +0000
    #104560# outlining of msvc mapfile symbols

cppuhelper/source/msvc_win32_intel.map was dropped in commit
b222aa8fff
    author	Matúš Kukan <matus.kukan@gmail.com>
    date	Tue Aug 23 15:03:09 2011 +0200
    cppuhelper: convert to gbuild

The symbol '??0OWeakObject@cppu@@QEAA@XZ' is still exported from
cppuhelper3MSC.dll (checked using dumpbin, that number and names of
exported symbols are the same), thanks to the CPPUHELPER_DLLPUBLIC
macro at the class, that expands to __declspec(dllexport) [1], [2].
Hence, this patch is expected to not cause an ABI change.

[1] https://docs.microsoft.com/en-us/cpp/cpp/dllexport-dllimport
[2] https://docs.microsoft.com/en-us/cpp/build/exporting-from-a-dll-using-declspec-dllexport

Change-Id: I895c350970f0e4e0adc1ba90f60925f8d4ba3941
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/127471
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

cppuhelper/source/weak.cxx

@@ -205,16 +205,6 @@ void SAL_CALL OWeakConnectionPoint::removeReference(const Reference< XReference
 
 //-- OWeakObject -------------------------------------------------------
 
-
-#ifdef _MSC_VER
-// Accidentally occurs in msvc mapfile = > had to be outlined.
-OWeakObject::OWeakObject()
-    : m_refCount( 0 ),
-      m_pWeakConnectionPoint( nullptr )
-{
-}
-#endif
-
 // XInterface
 Any SAL_CALL OWeakObject::queryInterface( const Type & rType )
 {

include/cppuhelper/weak.hxx

@@ -95,12 +95,6 @@ public:
         {}
     /// @endcond
 
-#ifdef _MSC_VER
-    /** Default Constructor.  Sets the reference count to zero.
-        Accidentally occurs in msvc mapfile = > had to be outlined.
-    */
-    OWeakObject();
-#else
     /** Default Constructor.  Sets the reference count to zero.
     */
     OWeakObject()
@@ -108,7 +102,7 @@ public:
         , m_pWeakConnectionPoint( NULL )
         , m_pReserved(NULL)
         {}
-#endif
+
     /** Dummy copy constructor.  Set the reference count to zero.
     */
     OWeakObject( const OWeakObject & )