nuklear: add package (#2241)

---------

Co-authored-by: Jérôme Leclercq <lynix680@gmail.com>

packages/n/nuklear/xmake.lua

@@ -0,0 +1,24 @@
+package("nuklear")
+
+    set_kind("library", {headeronly = true})
+    set_homepage("https://immediate-mode-ui.github.io/Nuklear/doc/index.html")
+    set_description("A single-header ANSI C immediate mode cross-platform GUI library")
+    set_license("MIT")
+
+    add_urls("https://github.com/Immediate-Mode-UI/Nuklear/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/Immediate-Mode-UI/Nuklear.git")
+
+    add_versions("4.10.5", "6c80cbd0612447421fa02ad92f4207da2cd019a14d94885dfccac1aadc57926a")
+
+    on_load("mingw", function (package)
+        -- see https://github.com/Immediate-Mode-UI/Nuklear/issues/320
+        package:add("defines", "NK_INCLUDE_FIXED_TYPES")
+    end)
+
+    on_install(function (package)
+        os.cp("nuklear.h", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:has_cincludes("nuklear.h"))
+    end)