Fix E_STRICT errors

Non-static method System::tmpdir() should not be called statically, assuming $this from incompatible context in /usr/share/pear/OLE/PPS/Root.php on line 56
Non-static method OLE::Asc2Ucs() should not be called statically, assuming $this from incompatible context in /usr/share/pear/OLE/PPS/Root.php on line 59
Non-static method OLE::LocalDate2OLE() should not be called statically, assuming $this from incompatible context in /usr/share/pear/OLE/PPS.php on line 190