Add building of an lzip tarball archive

.travis.yml

@@ -39,6 +39,7 @@ addons:
 
 script:
   - set -e
+  - sed -i 's/dist-lzip//g' configure.ac
   - ./autogen.sh
 #  CFI doesn't work out on Ubuntu 14.04 (Trusty). They don't include LLVMgold.so for clang-3.8.
 #  clang-3.4 doesn't know CFI yet.

configure.ac

@@ -2,7 +2,7 @@
 AC_INIT([libpsl], [0.20.2], [tim.ruehsen@gmx.de], [libpsl], [https://github.com/rockdaboot/libpsl])
 AC_PREREQ([2.59])
 AC_CONFIG_AUX_DIR([build-aux])
-AM_INIT_AUTOMAKE([1.10 no-define foreign])
+AM_INIT_AUTOMAKE([1.10 no-define foreign dist-lzip])
 
 # Generate two configuration headers; one for building the library itself with
 # an autogenerated template, and a second one that will be installed alongside