add a lib for rendering text in sdl2 and rules to make in makefile

SDL2_ttf/external/harfbuzz/.ci/publish_release_artifact.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+
+if [[ -z $GITHUB_TOKEN ]]; then
+	echo "No GITHUB_TOKEN secret found, artifact publishing skipped"
+	exit
+fi
+
+if ! hash ghr 2> /dev/null; then
+	_GHR_VER=v0.14.0
+	_GHR=ghr_${_GHR_VER}_linux_amd64
+	mkdir -p $HOME/.local/bin
+	curl -sfL https://github.com/tcnksm/ghr/releases/download/$_GHR_VER/$_GHR.tar.gz |
+		tar xz -C $HOME/.local/bin --strip-components=1 $_GHR/ghr
+fi
+
+ghr -replace \
+	-u $CIRCLE_PROJECT_USERNAME \
+	-r $CIRCLE_PROJECT_REPONAME \
+	$CIRCLE_TAG \
+	$1