Make ac_update_extern_pkg non-executable, in favour of invoking it via ac_config_iraf_pkg, since conda can break its interpreter path if there is one.
Make ac_update_extern_pkg non-executable, in favour of invoking it via ac_config_iraf_pkg, since conda can break its interpreter path if there is one.

jehturner/astroconda-utils,jehturner/astroconda-utils