Remove strdup.
Remove strdup.

No need for explicit use of strdup + free, the refs will be cleaned up
with the handles.

Signed-off-by: Nick Campbell <e31591b49bf5c9127aafb098f2b9d466891b32f9@gmail.com>

hildjj/libxmljs,Konsus/libxml,rc0x03/libxmljs,sergeche/libxmljs,Visya/libxmljs,Visya/libxmljs,Konsus/libxml,hildjj/libxmljs,gagern/libxmljs,improvisio-software/libxmljs,rc0x03/libxmljs,rc0x03/libxmljs,libxmljs/libxmljs,polotek/libxmljs,sergeche/libxmljs,improvisio-software/libxmljs,hildjj/libxmljs,libxmljs/libxmljs,libxmljs/libxmljs,Konsus/libxml,gagern/libxmljs,rchipka/libxmljs,rchipka/libxmljs,Visya/libxmljs,improvisio-software/libxmljs,rchipka/libxmljs,polotek/libxmljs,gagern/libxmljs,sergeche/libxmljs,polotek/libxmljs