libpcap: make bluetooth optional

[Peter Volkov <pva () gentoo org>]

Hello.

Currently if there are bluetooth.h headers installed in the system
libpcap will be built with bluetooth support and it's impossible to
disable it. Attached patch adds --{en,dis}able-bluetooth switches.

Also this patch makes use of AS_HELP_STRING to let autoconf manage
output layout.

-- 
Peter.

Attachment: libpcap-1.0.0-optional-bluetooth.patch
Description:

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