x11-links-0.83: Assume Xorg if x11.pc exists.

This fixes detection on RHEL-based distributions which have the X11 libraries
and development files installed but not the X server.
Updated pkgtools/x11-links to 0.83
add utf8 [default] option to ghostscript-gpl
Add special case for dependency checking in 'non-bootstrap' builds,
don't redefine 'pkg_info' if it already exists.
This is notably for pkg_rolling_replace -u in case pkg_install
was revbump'd and openssl happens to be in PKG_DEFAULT_OPTIONS.