add sys_time_h package (#2956)

* add sys_time_h

* Update xmake.lua

* Update xmake.lua

packages/s/sys_time_h/xmake.lua

@@ -0,0 +1,16 @@
+package("sys_time_h")
+    set_kind("library", {headeronly = true})
+    set_homepage("https://github.com/win32ports/sys_time_h")
+    set_description("header-only Windows implementation of the <sys/time.h> header")
+    set_license("MIT")
+
+    add_urls("https://github.com/win32ports/sys_time_h.git")
+    add_versions("2023.03.22", "128ff475e1abc2aec0450f369bf91952a9bd2a3e")
+
+    on_install("windows", function (package)
+        os.cp("sys", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:has_cfuncs("gettimeofday", {includes = "sys/time.h"}))
+    end)