[libextractor] Extract fails to load plugin when the path contain underscores

[Bertrand Marc]

Dear libextractor maintainers,

With the arrival of multiarch in Debian, the standard library path 
changes (e.g. /usr/lib/x86_64-linux-gnu/ for amd64). The fact that it 
contains an underscore causes extract to fail to load its plugins, see [1].

Fortunately, Harun Trefry kindly provided a patch against the last 
revision of you SVN that you'll find attached. Would you consider to 
include it ?

Cheers,
Bertrand

[1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=675063

underscore_in_plugin_path_SVN.patch
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