Add aklomp-base64. (#6763)

* add aklomp-base64.

* Update xmake.lua

* Update xmake.lua

packages/a/aklomp-base64/xmake.lua

@@ -0,0 +1,37 @@
+package("aklomp-base64")
+    set_homepage("https://github.com/aklomp/base64")
+    set_description("Fast Base64 stream encoder/decoder in C99, with SIMD acceleration.")
+    set_license("BSD-2-Clause")
+
+    add_urls("https://github.com/aklomp/base64/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/aklomp/base64.git")
+
+    add_versions("v0.5.2", "723a0f9f4cf44cf79e97bcc315ec8f85e52eb104c8882942c3f2fba95acc080d")
+
+    add_deps("cmake")
+    on_load(function (package)
+        package:add("links", "base64")
+        if not package:config("shared") then
+            package:add("defines", "BASE64_STATIC_DEFINE")
+        end
+    end)
+
+    on_install(function (package)
+        local configs = {}
+        table.insert(configs, "-DCMAKE_BUILD_TYPE="  .. (package:debug() and "Debug" or "Release"))
+        table.insert(configs, "-DBUILD_SHARED_LIBS=" .. (package:config("shared") and "ON" or "OFF"))
+        import("package.tools.cmake").install(package, configs)
+    end)
+
+    on_test(function (package)
+        assert(package:check_csnippets({test = [[
+            void test() {
+                char src[] = "hello world";
+                char out[20];
+                size_t srclen = sizeof(src) - 1;
+                size_t outlen;
+
+                base64_encode(src, srclen, out, &outlen, 0);
+            }
+        ]]}, {configs = {languages = "c99"}, includes = "libbase64.h"}))
+    end)