remove an obsolete ebuild for mod_mono

[ArsenShnurkov]

Right now emerge gives the error:

# emerge -auvDN world

These are the packages that would be merged, in order:

Calculating dependencies / * ERROR: www-apache/mod_mono-3.13::dotnet failed (depend phase):
 *   mono: EAPI 6 not supported
 * 
 * Call stack:
 *              ebuild.sh, line 657:  Called source '/var/db/repos/dotnet/www-apache/mod_mono/mod_mono-3.13.ebuild'
 *   mod_mono-3.13.ebuild, line   7:  Called inherit 'autotools' 'apache-module' 'eutils' 'go-mono' 'mono-env'
 *              ebuild.sh, line 337:  Called __qa_source '/var/db/repos/dotnet/eclass/go-mono.eclass'
 *              ebuild.sh, line 114:  Called source '/var/db/repos/dotnet/eclass/go-mono.eclass'
 / *         go-mono.eclass, line  12:  Called inherit 'versionator' 'mono'
 *              ebuild.sh, line 337:  Called __qa_source '/var/db/repos/gentoo/eclass/mono.eclass'
 *              ebuild.sh, line 114:  Called source '/var/db/repos/gentoo/eclass/mono.eclass'
 *            mono.eclass, line  18:  Called die
 * The specific snippet of code:
 *   	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
 * 
 * If you need support, post the output of `emerge --info '=www-apache/mod_mono-3.13::dotnet'`,
 * the complete build log and the output of `emerge -pqv '=www-apache/mod_mono-3.13::dotnet'`.
 * Working directory: '/usr/lib/python3.9/site-packages'
 * S: '/var/tmp/portage/www-apache/mod_mono-3.13/work/mod_mono-3.13'
... done!

This PR removes the old ebuild.

[ArsenShnurkov]

I created also the bug in bugtracker - https://bugs.gentoo.org/832320

[thesamesam]

Thanks!