Makefile: add gummiboot-setup to 'install'
Makefile: add gummiboot-setup to 'install'

karelzak/gummiboot,freedesktop-unofficial-mirror/gummiboot,aaronp24/gummiboot,miguelinux/gummiboot2systemd-boot,FrozenCow/gummiboot,liliang365/my_gummiboot,liliang365/my_gummiboot,todorez/gummiboot-multiboot2,freedesktop-unofficial-mirror/gummiboot,trilean/gummiboot,karelzak/gummiboot,FrozenCow/gummiboot,todorez/tummiboot,aaronp24/gummiboot,trilean/gummiboot,miguelinux/gummiboot2systemd-boot,todorez/tummiboot,todorez/gummiboot-multiboot2