comphelper: avoid -Werror=deprecated-copy (GCC trunk towards GCC 9)

...by removing explicitly user-provided functions that do the same as their
implicitly-defined counterparts, but may prevent implicitly declared copy
functions from being defined as non-deleted in the future.  (Even if a dtor was
declared non-inline in an include file, the apparently-used implicitly-defined
copy functions are already inline, so why bother with a non-inline dtor.)

Change-Id: Id5494686dd169b17de7830588e603d1fd5f6b768
Reviewed-on: https://gerrit.libreoffice.org/58061
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

comphelper/source/misc/logging.cxx

@@ -72,12 +72,6 @@ namespace comphelper
     {
     }
 
-
-    EventLogger::~EventLogger()
-    {
-    }
-
-
     bool EventLogger::isLoggable( const sal_Int32 _nLogLevel ) const
     {
         if ( !m_pImpl->isValid() )

include/comphelper/logging.hxx

@@ -108,8 +108,6 @@ namespace comphelper
             const sal_Char* _pAsciiLoggerName
         );
 
-        ~EventLogger();
-
     public:
         /// determines whether an event with the given level would be logged
         bool        isLoggable( const sal_Int32 _nLogLevel ) const;