Fix the following build failure raised since libpcap version 1.10.2 and
https://github.com/the-tcpdump-group/libpcap/commit/d0cba780dc2b2bb4f3ca9427d1a0f03479f45707:

pcap-config: Invalid command-line option pcap-config specified
Usage: pcap-config [ --help ] [ --static | --static-pcap-only ] [ --libs | --additional-libs ]
perl -nle 'm/^Version:\s+(.*)$/ and print $1' \
	bustle.cabal > dist/build/autogen/version.txt
echo '#define BUSTLE_VERSION "'`cat dist/build/autogen/version.txt`'"' > dist/build/autogen/version.h
/home/buildroot/autobuild/run/instance-2/output-1/host/bin/arm-linux-gcc -Idist/build/autogen -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os -g0  -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  \
	-o dist/build/bustle-pcap c-sources/pcap-reader.c c-sources/pcap-monitor.c c-sources/bustle-pcap.c \
	-I/home/buildroot/autobuild/run/instance-2/output-1/host/bin/../arm-buildroot-linux-uclibcgnueabi/sysroot/usr/include/glib-2.0 ...