contrib: add BGHUDAppKit (doesn't build)

contrib/src/bghudappkit/rules.mak

+# bghudappkit
+
+BGHUDAPPKIT_GITURL := https://github.com/binarygod/BGHUDAppKit.git
+
+ifdef HAVE_MACOSX
+PKGS += bghudappkit
+endif
+
+$(TARBALLS)/bghudappkit-git.tar.xz:
+	$(call download_git,$(BGHUDAPPKIT_GITURL))
+
+
+.sum-bghudappkit: bghudappkit-git.tar.xz
+	$(warning $@ not implemented)
+	touch $@
+
+
+bghudappkit: bghudappkit-git.tar.xz .sum-bghudappkit
+	$(UNPACK)
+	$(MOVE)
+
+.bghudappkit: bghudappkit
+	cd $< && $(MAKE) && exit 1 #FIXME
+	touch $@