Fix the `sysincludedirs` for opencv (homebrew) (#3326)

* fix: also fix opencv `sysincludedirs` for brew

* Update xmake.lua

---------

Co-authored-by: ruki <waruqi@gmail.com>

packages/o/opencv/xmake.lua

@@ -55,13 +55,19 @@ package("opencv")
         if opt.system then
             local result = package:find_package("brew::opencv", opt)
             if result then
-                for _, includedir in ipairs(result.sysincludedirs or result.includedirs) do
+                local includedirs = table.wrap(result.sysincludedirs or result.includedirs)
+                for _, includedir in ipairs(includedirs) do
                     local dir = path.join(includedir, "opencv4")
                     if os.isdir(dir) then
-                        result.includedirs = table.wrap(result.includedirs)
+                        table.insert(includedirs, dir)
-                        table.insert(result.includedirs, dir)
                     end
                 end
+                if result.sysincludedirs then
+                    result.sysincludedirs = includedirs
+                end
+                if result.includedirs then
+                    result.includedirs = includedirs
+                end
             end
             return result
         end