debian/libpcp3-dev.install: add series.h to fix Debian build breakage
debian/libpcp3-dev.install: add series.h to fix Debian build breakage

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp