travis: build libpsl and make builds use it

closes #2471

.travis.yml

@@ -1,5 +1,14 @@
 language: c
 sudo: required
+cache:
+    directories:
+        - $HOME/libpsl-0.20.1
+        - $HOME/libidn2-2.0.4
+
+env:
+    global:
+        - LD_LIBRARY_PATH=/usr/local/lib
+
 addons:
     apt:
         config:
@@ -22,6 +31,8 @@ addons:
             - libssh2-1-dev
             - libssh-dev
             - krb5-user
+            - autopoint  # for libpsl that needs autoreconf that uses gettext that needs it
+            - libunistring-dev # for libidn2 neeed by libpsl
 
 matrix:
     include:
@@ -48,7 +59,7 @@ matrix:
         - os: linux
           compiler: gcc
           dist: trusty
-          env: T=novalgrind BORINGSSL=yes -C="--with-ssl=$HOME/boringssl" LD_LIBRARY_PATH=/home/travis/boringssl/lib
+          env: T=novalgrind BORINGSSL=yes -C="--with-ssl=$HOME/boringssl" LD_LIBRARY_PATH=/home/travis/boringssl/lib:/usr/local/lib
         - os: linux
           compiler: clang
           dist: trusty
@@ -123,6 +134,7 @@ before_script:
                   sudo make install
               )
           fi
+    - |
       if [ "$TRAVIS_OS_NAME" = linux -a "$BORINGSSL" ]; then
         (cd $HOME &&
         git clone --depth=1 https://boringssl.googlesource.com/boringssl &&
@@ -139,6 +151,34 @@ before_script:
         echo "BoringSSL lib dir: "`pwd` &&
         export LIBS=-lpthread )
       fi
+    - |
+      if [ $TRAVIS_OS_NAME = linux ]; then
+        if [ ! -e $HOME/libidn2-2.0.4/Makefile ]; then
+          (cd $HOME && \
+          curl -LO https://ftp.gnu.org/gnu/libidn/libidn2-2.0.4.tar.gz && \
+          tar -xzf libidn2-2.0.4.tar.gz && \
+          cd libidn2-2.0.4 && \
+          ./configure && \
+          make)
+        fi
+      fi
+    - |
+      if [ $TRAVIS_OS_NAME = linux ]; then
+        if [ ! -e $HOME/libpsl-0.20.1/Makefile ]; then
+          (cd $HOME && \
+          curl -LO https://github.com/rockdaboot/libpsl/releases/download/libpsl-0.20.1/libpsl-0.20.1.tar.gz && \
+          tar -xzf libpsl-0.20.1.tar.gz && \
+          cd libpsl-0.20.1 && \
+          autoreconf -i && \
+          ./configure && \
+          make)
+        fi
+      fi
+    - |
+      if [ $TRAVIS_OS_NAME = linux ]; then
+        (cd $HOME/libidn2-2.0.4 && sudo make install)
+        (cd $HOME/libpsl-0.20.1 && sudo make install)
+      fi
 
 script:
     - |