[mojosetup] Improve escaping in the uninstall script

[Francois Gouget]

In my private builds I use "`$' myapp" as the install id. I know it's 
not a very reasonable id; I do this so that my product will 
automatically install in "$HOME/`$' myapp" which helps make sure all my 
scripts quote and escape their arguments correctly.

So while testing this I discovered that MojoSetup was a bit short on 
escaping in the uninstall script hence the proposed patch.

In addition to escaping the values that come from config.lua I also 
added an extra pair of backslashes to the dirname call: `dirname "$0"` 
is ok but if I add an extra level of quoting I feel it should really be 
"`dirname \"$0\"`".

-- 
François Gouget
fgouget at codeweavers.com

-------------- next part --------------
A non-text attachment was scrubbed...
Name: mojosetup-20100916-1.diff
Type: text/x-patch
Size: 1828 bytes
Desc: not available
URL: <http://icculus.org/pipermail/mojosetup/attachments/20100916/1896f5ee/attachment.bin>