www/awstats: Remove awdownloadcsv.pl (security vuln)

Problem:
awdownloadcsv.pl is vulnerable to command injection and path traversal,
ref [1] and [2].
The GitHub issue [1] mentions that it is deprecated, and the readme does
not list this file among the files that are (supposed to be) part of the
distribution.

Solution:
This commit prevents awdownloadcsv.pl to be installed, thus removing the
vulnerability.

[1] https://github.com/eldy/AWStats/issues/276
[2] https://www.openwall.com/lists/oss-security/2026/03/08/8

While here, clean up sorting of IPV6_RUN_DEPENDS.

PR: 293698
MFH: 2026Q1