Add Varnish5 compatibility

[liyo]

This is just a working version to build vmod for Varnish5. It probably can be improved.

[JonathanHuot]

Hi @liyo , have you tested with PR #9 ? I did approximatively the same thing copying changes from libvmod-example instead.

However, fastly team does not seem very active on this.

[liyo]

Hey @JonathanHuot, I tried your PR #9 but I couldn't make it build on my Varnish5 install. The following error is shown when I try to use it:

configure.ac:13: installing 'build-aux/compile'
configure.ac:13: installing 'build-aux/config.guess'
configure.ac:13: installing 'build-aux/config.sub'
configure.ac:9: installing 'build-aux/install-sh'
configure.ac:9: installing 'build-aux/missing'
automake: warnings are treated as errors
/usr/share/automake-1.14/am/ltlibrary.am: warning: 'libvmod_urlcode.la': linking libtool libraries using a non-POSIX
/usr/share/automake-1.14/am/ltlibrary.am: archiver requires 'AM_PROG_AR' in 'configure.ac'
src/Makefile.am:4: while processing Libtool library 'libvmod_urlcode.la'
src/Makefile.am: installing 'build-aux/depcomp'
parallel-tests: installing 'build-aux/test-driver'
ERROR: Service 'varnish' failed to build: The command '/bin/sh -c curl -SLO "https://github.com/thomsonreuters/libvmod-urlcode/archive/master.tar.gz" && mkdir -p /usr/local/varnish-libvmod-urlcode && tar -xzvf "master.tar.gz" -C /usr/local/varnish-libvmod-urlcode --strip-components=1 && cd /usr/local/varnish-libvmod-urlcode && ./autogen.sh && ./configure VARNISHSRC=/usr/local/varnish-cache && make && make install' returned a non-zero code: 1

[JonathanHuot]

Thanks @liyo, it seems a different automake version was used in my tests. I should have fixed it now. Could you retest it please ?
Thanks in advance!