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[3.0] Detect endless #include loop when parsing profiles

Christian Boltz requested to merge cboltz/apparmor:cboltz-3.0-detect-self-include into apparmor-3.0

If an include file includes itsself (for example if local/foo has '#include <local/foo>'), print a warning instead of calling load_include() again and again.

This fixes a crash when hitting such a case: RecursionError: maximum recursion depth exceeded while calling a Python object

Fixes: https://bugzilla.suse.com/show_bug.cgi?id=1184779 for the tools. The parser will also need a fix.

This is the 3.0 version of 30323a2d / !742 (merged)

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