xboard from home:rjmathar project

For Fedora 39 run the following as root:

dnf config-manager --add-repo https://download.opensuse.org/repositories/home:rjmathar/Fedora_39/home:rjmathar.repo
dnf install xboard

For Fedora 38 run the following as root:

dnf config-manager --add-repo https://download.opensuse.org/repositories/home:rjmathar/Fedora_38/home:rjmathar.repo
dnf install xboard

For openSUSE Tumbleweed run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:rjmathar/openSUSE_Tumbleweed/home:rjmathar.repo
zypper refresh
zypper install xboard

For 15.5 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:rjmathar/15.5/home:rjmathar.repo
zypper refresh
zypper install xboard

For 15.4 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:rjmathar/15.4/home:rjmathar.repo
zypper refresh
zypper install xboard

For Fedora 37 run the following as root:

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