Add "fd" and "close-fd" properties including getters and setters. Patch by

Add "fd" and "close-fd" properties including getters and setters. Patch by

        * gio.symbols:
        * gunixinputstream.[hc]:
        * gunixoutputstream.[hc]: Add "fd" and "close-fd" properties
        including getters and setters. Patch by Maciej Piechotka

svn path=/trunk/; revision=7735