[Bro] af_packet plugin does not compile

[erik clark]

Af_packet plugin does not compile with same dependencies as Bro. Bro
compiles cleanly (2.5). Af_packet plugin states:

CMake Error at ...RequireCXX11.cmake:31
C++11 headers cannot be used for compilation

This is from the bro 2.5 release from last year and not a github
update.Af_packet plugin documentation has nothing to say about why this
would occur.
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