xdg_user_dirs patches

[Vijay Kiran Kamuju]

Hi Lei,

I think a new file for user dir look up in the shell32 is of no use.
Rather than we can add it to the xdg.c and xdg.h, as it contains the
generic xdg code for shell32.
Its like having all xdg specific code at one place.
This is my personal opinion about those patches.

Thanks,
VJ