fix(link): _merged.obj 存在时仍链接 include 的 .obj

_merged.obj 只合并非 include 模块；此前命中该分支后跳过 include 的 .obj，导致 argparse.print_help 等符号未链接进 exe。

lib/Projectrans/Phase2Translator.py

@@ -4913,15 +4913,21 @@ class Phase2Translator:
         """将 active_sha1s 对应的 .obj 文件和 includes 库文件链接为可执行文件"""
         obj_files = []
         merged_obj = os.path.join(self.output_dir, '_merged.obj')
-        if _CachedIsFile(merged_obj):
+        has_merged: bool = _CachedIsFile(merged_obj)
+        if has_merged:
+            # _merged.obj 只合并了非 include 模块，include 的 .obj 仍需单独链接
             obj_files.append(merged_obj)
-        else:
-            for root, dirs, files in os.walk(self.output_dir):
-                for file in files:
-                    if file.endswith('.obj'):
-                        sha1 = file[:-4]
-                        if sha1 in active_sha1s and sha1 not in self._include_sha1s:
-                            obj_files.append(os.path.join(root, file))
+        for root, dirs, files in os.walk(self.output_dir):
+            for file in files:
+                if file.endswith('.obj'):
+                    sha1 = file[:-4]
+                    if sha1 not in active_sha1s:
+                        continue
+                    if has_merged and sha1 not in self._include_sha1s:
+                        continue
+                    if not has_merged and sha1 in self._include_sha1s:
+                        continue
+                    obj_files.append(os.path.join(root, file))
 
         if not obj_files and not self.extra_link_files:
             _vlog().info("[链接] 无文件可链接")