build: add option to disable bsd library inclusion #2587
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It might be needed to disable bsd inclusion and fallback to the compat functions even if bsd headers are detected.
This is the case when multiple library are cross-compiled and someone wants to explicitly compile aircrack-ng without linking to bsd library.
With the current implementation, if a bsd header is detected, the bsd library is always linked even if unwanted. Add option to configure this with the combo --with-libbsd=yes|no|auto with auto set by default.
Also add an extra featurw with introducing the possibility of requiring the bsd library and fail the configure phase.