lightmapper: add package (#2456)

packages/l/lightmapper/xmake.lua

@@ -0,0 +1,15 @@
+package("lightmapper")
+    set_kind("library", {headeronly = true})
+    set_homepage("https://github.com/ands/lightmapper")
+    set_description("A C/C++ single-file library for drop-in lightmap baking. Just use your existing OpenGL renderer to bounce light!")
+
+    add_urls("https://github.com/ands/lightmapper.git")
+    add_versions("2022.01.03", "4fd3bf4e2c07263f85d5d875ebdef061bc512dd4")
+
+    on_install(function (package)
+        os.cp("lightmapper.h", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:has_cfuncs("lmCreate", {includes = "lightmapper.h", configs = {languages = "c99"}}))
+    end)