salhelper: 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

Change-Id: I58b1b41823fa9eb5f37187272e38a2df80c48afb
Reviewed-on: https://gerrit.libreoffice.org/58103
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

include/salhelper/timer.hxx

@@ -56,12 +56,6 @@ struct SAL_WARN_UNUSED TTimeValue : public TimeValue
         normalize();
     }
 
-    TTimeValue( const TTimeValue& rTimeValue ):
-        TimeValue(rTimeValue)
-    {
-        normalize();
-    }
-
     TTimeValue( const TimeValue& rTimeValue )
     {
         Seconds = rTimeValue.Seconds;