Non-inline virtual dtors of exported classes

Change-Id: I7b3597d48bf7b0196b98c869329d2fb1a46fa8f2

include/unotools/streamwrap.hxx

@@ -82,6 +82,8 @@ class UNOTOOLS_DLLPUBLIC OSeekableInputStreamWrapper : public ::cppu::ImplInheri
 {
 protected:
     OSeekableInputStreamWrapper() {}
+    ~OSeekableInputStreamWrapper() override;
+
 public:
     OSeekableInputStreamWrapper(SvStream& _rStream);
     OSeekableInputStreamWrapper(SvStream* _pStream, bool _bOwner = false);
@@ -146,6 +148,9 @@ private:
 
 class UNOTOOLS_DLLPUBLIC OStreamWrapper : public ::cppu::ImplInheritanceHelper3 < OSeekableInputStreamWrapper, css::io::XStream, css::io::XOutputStream, css::io::XTruncate >
 {
+protected:
+    ~OStreamWrapper() override;
+
 public:
     OStreamWrapper(SvStream& _rStream);
 

unotools/source/streaming/streamwrap.cxx

@@ -139,6 +139,8 @@ void OInputStreamWrapper::checkError() const
 
 //= OSeekableInputStreamWrapper
 
+OSeekableInputStreamWrapper::~OSeekableInputStreamWrapper() = default;
+
 OSeekableInputStreamWrapper::OSeekableInputStreamWrapper(SvStream& _rStream)
 {
     SetStream( &_rStream, false );
@@ -276,6 +278,8 @@ sal_Int64 SAL_CALL OSeekableOutputStreamWrapper::getLength(  ) throw (IOExceptio
     return (sal_Int64)nEndPos;
 }
 
+OStreamWrapper::~OStreamWrapper() = default;
+
 OStreamWrapper::OStreamWrapper(SvStream& _rStream)
 {
     SetStream( &_rStream, false );