Revert "install vmod_header.vcc which is required by libvmod-statsd"

This reverts commit 27e330b2113f2cf1ea71dad1e21e645ce787c693.
the commit message is false. it's not required. my fault when i port
files/patch-src__Makefile.am
bugfix: www/varnish-libvmod-header is not required in any way

see df13e04