improve libaio (#2144)

packages/l/libaio/xmake.lua

@@ -8,6 +8,8 @@ package("libaio")
              "https://pagure.io/libaio.git")
     add_versions("0.3.113", "716c7059703247344eb066b54ecbc3ca2134f0103307192e6c2b7dab5f9528ab")
 
+    add_configs("shared", {description = "Build shared library.", default = true, type = "boolean", readonly = true})
+
     on_install("linux", function (package)
         io.replace("Makefile", "prefix=/usr", "prefix=" .. package:installdir())
         import("package.tools.make").make(package, {})