pencil2d-git from home:mazdlc project

对于 Arch Linux，请编辑 /etc/pacman.conf 并添加以下内容（注意 pacman.conf 中的软件源顺序是很重要的，因为 pacman 总是会下载第一个找到的软件包）：

[home_mazdlc_Arch_Extra]
Server = https://download.opensuse.org/repositories/home:/mazdlc/Arch_Extra/$arch

然后以 root 身份运行以下命令

key=$(curl -fsSL https://download.opensuse.org/repositories/home:mazdlc/Arch_Extra/$(uname -m)/home_mazdlc_Arch_Extra.key)
fingerprint=$(gpg --quiet --with-colons --import-options show-only --import --fingerprint <<< "${key}" | awk -F: '$1 == "fpr" { print $10 }')

pacman-key --init
pacman-key --add - <<< "${key}"
pacman-key --lsign-key "${fingerprint}"

pacman -Sy home_mazdlc_Arch_Extra/pencil2d-git