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Fix libdns CFLAGS

Michał Kępień requested to merge michal/fix-libdns-cflags into main


!3503 (comment 143454)

What happens here is that on FreeBSD, building with --enable-dnstap works, but breaks with --enable-dnstap --without-lmdb. This is because both fstrm and LMDB are installed into /usr/local, but checking for LMDB inadvertently updates CFLAGS with LMDB-provided CFLAGS due to a bug in m4/ax_lib_lmdb.m4 (which is also fixed by this MR). When LMDB support is disabled, -I/usr/local/include no longer appears in CFLAGS and thus a dnstap-enabled build fails.

Edited by Michał Kępień

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