Merging upstream version 2.3.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

.lgtm.yml

@@ -0,0 +1,26 @@
+extraction:
+  cpp:
+    prepare:
+      packages:
+        - build-essential
+        - automake
+        - autoconf
+        - libtool
+        - pkg-config
+        - libpcap-dev
+        - libldns-dev
+        - libyaml-perl
+        - zlib1g-dev
+        - libssl-dev
+    after_prepare:
+      - git clone https://github.com/DNS-OARC/cryptopANT.git
+      - cd cryptopANT
+      - ./autogen.sh
+      - ./configure --prefix="$PWD/../root"
+      - make
+      - make install
+      - cd ..
+    configure:
+      command:
+        - ./autogen.sh
+        - ./configure --with-extra-cflags="-I $PWD/root/include" --with-extra-ldflags="-L$PWD/root/lib"