add mingw&cross support to eigen&abseil (#2497)

* add mingw support to abseil

* add cross support to eigen

packages/a/abseil/xmake.lua

@@ -48,7 +48,7 @@ package("abseil")
         end
     end)
 
-    on_install("macosx", "linux", "windows", function (package)
+    on_install("macosx", "linux", "windows", "mingw", "cross", function (package)
         local configs = {"-DCMAKE_CXX_STANDARD=17"}
         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"))

packages/e/eigen/xmake.lua

@@ -24,7 +24,7 @@ package("eigen")
     add_includedirs("include")
     add_includedirs("include/eigen3")
 
-    on_install("macosx", "linux", "windows", "mingw", function (package)
+    on_install("macosx", "linux", "windows", "mingw", "cross", function (package)
         import("package.tools.cmake").install(package, {"-DBUILD_TESTING=OFF"})
     end)