add libui (#1772)

* Added libui

* Fixed issues

* Fix issues

* Update xmake.lua

* Update xmake.lua

* Update xmake.lua

* Update xmake.lua

* Update xmake.lua

* Update xmake.lua

* Update xmake.lua

* add glib

* add gtk3 on ci

* fix glib

* revert ci

---------

Co-authored-by: Amrit Bhogal <ambhogal01@gmail.com>

packages/l/libui/xmake.lua

@@ -0,0 +1,26 @@
+package("libui")
+    set_homepage("https://libui-ng.github.io/libui-ng/")
+    set_description("A portable GUI library for C")
+
+    set_urls("https://github.com/libui-ng/libui-ng.git")
+    add_versions("2022.12.3", "8c82e737eea2f8ab3667e227142abd2fd221f038")
+
+    add_deps("meson", "ninja")
+
+    if is_plat("macosx") then
+        add_frameworks("CoreGraphics", "CoreText", "Foundation", "AppKit")
+    elseif is_plat("windows") then
+        add_syslinks("user32", "ole32", "gdi32", "d2d1", "dwrite", "comctl32", "windowscodecs")
+    elseif is_plat("linux") then
+        add_deps("gtk+3", "glib")
+    end
+
+    on_install("linux", "macosx", "windows", function (package)
+        local configs = {"-Dexamples=false", "-Dtests=false"}
+        table.insert(configs, "--default-library=" .. (package:config("shared") and "shared" or "static"))
+        import("package.tools.meson").install(package, configs)
+    end)
+
+    on_test(function (package)
+        assert(package:has_cfuncs("uiInit", {includes = "ui.h"}))
+    end)