configure.ac: dpdk: use pkg-config - 5.7 #2417
Merged
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To detect cflags and libs use the sometimes provided pkg-config for
libdpdk. That avoids build errors on systems where special flags are
needed and provided by dpdk via pkg-config, but not yet considered by
the collectd build system.
Backport of #2400 and #2405 tested on Debian.