[convertutf] Add package (#1972)

* [convertutf] Add package

* [convertutf] Date

* [convertutf] Export symbols when kind is `shared`

* [convertutf] Export symbols on windows only

packages/c/convertutf/xmake.lua

@@ -0,0 +1,27 @@
+package("convertutf")
+    set_homepage("https://home.unicode.org/")
+    set_description("Conversions between UTF-32, UTF-16, and UTF-8. Circa 2004.")
+
+    set_urls("https://github.com/xmake-mirror/convertutf/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/xmake-mirror/convertutf.git")
+    add_versions("v1.0.1", "ecd79378cc9f24034a2edebf5f198e84c9eb8046261f8208908d2b29d4fa4d99")
+
+    on_install(function (package)
+        io.writefile("xmake.lua", [[
+            target("convertutf")
+                set_kind("$(kind)")
+                set_languages("c99")
+                add_files("ConvertUTF.c")
+                add_headerfiles("ConvertUTF.h")
+                if is_plat("windows") and is_kind("shared") then
+                    add_rules("utils.symbols.export_all")
+                end
+        ]])
+        local configs = {}
+        configs.kind = package:config("shared") and "shared" or "static"
+        import("package.tools.xmake").install(package, configs)
+    end)
+
+    on_test(function (package)
+        assert(package:has_cfuncs("ConvertUTF8toUTF16", {includes = "ConvertUTF.h"}))
+    end)