Unbounded recursion in GetDatabase() when parsing include files [CVE-2013-2004 1/2]

GetIncludeFile() can call GetDatabase() which can call GetIncludeFile()
which can call GetDatabase() which can call GetIncludeFile() ....
eventually causing recursive stack overflow and crash.

Easily reproduced with a resource file that #includes itself.

Limit is set to a include depth of 100 files, which should be enough
for all known use cases, but could be adjusted later if necessary.

Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Matthieu Herrb <matthieu.herrb@laas.fr>

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