fix pyuno compile on Fedora29

'PyUnicode_GetSize' is deprecated [-Werror,-Wdeprecated-declarations]

Change-Id: Id298d6a2b0af9ce418f9124c9addda55fcdc0318
Reviewed-on: https://gerrit.libreoffice.org/62687
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

pyuno/source/module/pyuno_type.cxx

@@ -135,7 +135,11 @@ sal_Unicode PyChar2Unicode( PyObject *obj )
             "attribute value of uno.Char is not a unicode string" );
     }
 
+#if PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION >= 3
+    if( PyUnicode_GetLength( value.get() ) < 1 )
+#else
     if( PyUnicode_GetSize( value.get() ) < 1 )
+#endif
     {
         throw RuntimeException(
             "uno.Char contains an empty unicode string");