build-sys: add headers as dependency
build-sys: add headers as dependency

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