latexindent is installed by texlive-binextra, but its perl module
dependencies were declared by app-text/texlive-core, where they also were
the only (transitive) source of dev-lang/perl.
Move them to texlive-binextra and let texlive-core depend on dev-lang/perl
directly, which it needs for tlmgr, updmap and fmtutil.
Signed-off-by: Florian Schmaus <flow@gentoo.org>