* bugfix: prevent the lexer getting confused if the first thing inside
an alias{} block is an open paren
* bugfix: don't crash if an rv2cv op is built with PL_parser null
* bugfix: handle variant structure of entersub op which lacks (ex-)list
op as direct child
* bugfix: squash bogus dtrace-related macro definitions that are picked
up due to defining PERL_CORE
* switch all pp functions to internal linkage
* avoid some compiler warnings
OBS-URL: https://build.opensuse.org/package/show/devel:languages:perl/perl-Data-Alias?expand=0&rev=7