remove "selinux" build tag (Always compile SELinux support)

The build tag was removed in go-selinux v1.8.0: https://github.com/opencontainers/selinux/pull/132

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

script/release.sh

@@ -26,8 +26,7 @@ root="$(readlink -f "$(dirname "${BASH_SOURCE}")/..")"
 function build_project() {
 	builddir="$(dirname "$1")"
 
-	# Build with all tags enabled.
-	make -C "$root" COMMIT_NO= BUILDTAGS="seccomp selinux" static
+	make -C "$root" COMMIT_NO= static
 	mv "$root/$project" "$1"
 }