wasm: set embind option in executable finalizer

This prevents setting it more than once, which will
on recent Emscripten versions cause 'duplicate symbol'
linker errors.

Change-Id: Ie6c2ede0569271cf3a02fc993b14bbf27f69ff57
Reviewed-by: Piotr Wierciński <piotr.wiercinski@qt.io>
(cherry picked from commit 320cb68ce5c0c718c6434adfefa6c7460e3cb08a)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

cmake/QtWasmHelpers.cmake

@@ -11,8 +11,6 @@ function (qt_internal_setup_wasm_target_properties wasmTarget)
     "SHELL:-s WASM_BIGINT=1"
     "SHELL:-s STACK_SIZE=5MB")
 
-    target_link_libraries("${wasmTarget}" INTERFACE embind)
-
     ## wasm64
     if (WASM64)
         target_compile_options("${wasmTarget}" INTERFACE "SHELL:-s MEMORY64=1" )
@@ -118,6 +116,7 @@ function(qt_internal_wasm_add_finalizers target)
     qt_add_list_file_finalizer(_qt_internal_set_wasm_export_name ${target})
     qt_add_list_file_finalizer(_qt_internal_add_wasm_extra_exported_methods ${target})
     qt_add_list_file_finalizer(_qt_internal_wasm_add_target_helpers ${target})
+    qt_add_list_file_finalizer(_qt_internal_set_wasm_embind_option ${target})
 endfunction()
 
 

src/corelib/Qt6CoreMacros.cmake

@@ -731,6 +731,7 @@ function(_qt_internal_finalize_executable target)
         _qt_internal_wasm_add_target_helpers("${target}")
         _qt_internal_add_wasm_extra_exported_methods("${target}")
         _qt_internal_set_wasm_export_name("${target}")
+        _qt_internal_set_wasm_embind_option("${target}")
     endif()
 
     if(APPLE)

src/corelib/Qt6WasmMacros.cmake

@@ -139,3 +139,7 @@ function(_qt_internal_wasm_export_name_for_target out target)
         set(${out} "${target}_entry" PARENT_SCOPE)
     endif()
 endfunction()
+
+function(_qt_internal_set_wasm_embind_option target)
+    target_link_libraries("${target}" PRIVATE embind)
+endfunction()