strip second parameter from ISOWEEKNUM if literal double != 1.0

For other arguments convert to WEEKNUM_OOO, which now can be saved as
ORG.LIBREOFFICE.WEEKNUM_OOO.

Change-Id: I63fd3df1ec4ccaa535a1437200854d8734544a2c

formula/source/core/api/FormulaCompiler.cxx

@@ -1412,12 +1412,6 @@ void FormulaCompiler::Factor()
                 pFacToken->SetByte( nSepCount );
                 if (nSepCount == 2)
                 {
-                    /* XXX TODO FIXME: activate this conversion to ISOWEEKNUM
-                     * when at least two releases can actually handle the real
-                     * ISOWEEKNUM with one parameter, i.e. for 5.3 or 5.2 if
-                     * 5.0.5 is patched. Until then unconditionally use the
-                     * WEEKNUM_OOO compatibility function. */
-#if 0
                     // An old mode!=1 indicates ISO week, remove argument if
                     // literal double value and keep function. Anything else
                     // can not be resolved, there exists no "like ISO but week
@@ -1440,11 +1434,6 @@ void FormulaCompiler::Factor()
                         // compatibility function.
                         pFacToken->NewOpCode( ocWeeknumOOo, FormulaToken::PrivateAccess());
                     }
-#else
-                    (void) nSepPos;
-                    // Use compatibility function.
-                    pFacToken->NewOpCode( ocWeeknumOOo, FormulaToken::PrivateAccess());
-#endif
                 }
                 PutCode( pFacToken );
             }