update lemon cxx=14 (#2650)

packages/l/lemon/xmake.lua

@@ -7,13 +7,13 @@ package("lemon")
     add_urls("http://lemon.cs.elte.hu/pub/sources/lemon-$(version).tar.gz")
     add_versions("1.3.1", "71b7c725f4c0b4a8ccb92eb87b208701586cf7a96156ebd821ca3ed855bad3c8")
 
-    if is_plat("windows") then
+    if is_plat("windows", "mingw") then
         add_configs("shared", {description = "Build shared library.", default = false, type = "boolean", readonly = true})
     end
 
     add_deps("cmake")
-    on_install("windows", "macosx", "linux", function (package)
-        local configs = {"-DLEMON_ENABLE_GLPK=OFF", "-DLEMON_ENABLE_ILOG=OFF", "-DLEMON_ENABLE_COIN=OFF", "-DLEMON_ENABLE_SOPLEX=OFF"}
+    on_install("windows", "macosx", "linux", "mingw", "cross", function (package)
+        local configs = {"-DLEMON_ENABLE_GLPK=OFF", "-DLEMON_ENABLE_ILOG=OFF", "-DLEMON_ENABLE_COIN=OFF", "-DLEMON_ENABLE_SOPLEX=OFF", "-DCMAKE_CXX_STANDARD=14"}
         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)