Updated git_xorg script with new checks - Additional diff

[Shawn Starr]

> Hi,
>
> I have updated the git_xorg script, If there are no problems, I will upload
> this to the wiki later. Please test,  I have tried this on a LFS system and
> a Debian unstable machine.
>
>  - Add support for pulling XCB (optional).
>  - Add system check for required SCM tools and packages to be installed.
>  - Pull from CVS xlibs/xkbdesc.
>  - Pull Mesa and drm too.
>

I have found some small typos that I didn't notice til now. Apply this diff to 
the script to correct.

Thanks,
Shawn.
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