[fix] bundle the matching Slint runtime in Linux packages

apps/desktop/xmake/targets.lua

@@ -20,7 +20,7 @@ function setup_targets()
         "CROSSDESK_VERSION_NUMERIC=" .. table.concat(version_parts, ","))
 
     local function copy_slint_runtime(target)
-        if not target:is_plat("windows") then
+        if not target:is_plat("windows", "linux") then
             return
         end
 
@@ -28,8 +28,16 @@ function setup_targets()
         if not slint and target:dep("gui") then
             slint = target:dep("gui"):pkg("slint")
         end
-        assert(slint, "the Slint package is required to copy its Windows runtime")
+        assert(slint, "the Slint package is required to copy its runtime")
         local runtime_dir = path.join(slint:installdir(), "lib")
+        if target:is_plat("linux") then
+            -- Package the runtime selected for this build. Multiple Slint builds
+            -- with the same version/SONAME can have different patched APIs.
+            local runtime_so = path.join(runtime_dir, "libslint_cpp.so")
+            assert(os.isfile(runtime_so), "Slint runtime not found: " .. runtime_so)
+            os.cp(runtime_so, target:targetdir())
+            return
+        end
         local runtime_dll = path.join(runtime_dir, "slint_cpp.dll")
         assert(os.isfile(runtime_dll), "Slint runtime not found: " .. runtime_dll)
         import("utils.binary.deplibs")