win32: add an option to control window title bar state

Fixes: #11432

options/options.c

@@ -114,6 +114,7 @@ static const m_option_t mp_vo_opt_list[] = {
     {"ontop-level", OPT_CHOICE(ontop_level, {"window", -1}, {"system", -2},
         {"desktop", -3}), M_RANGE(0, INT_MAX)},
     {"border", OPT_BOOL(border)},
+    {"title-bar", OPT_BOOL(title_bar)},
     {"on-all-workspaces", OPT_BOOL(all_workspaces)},
     {"geometry", OPT_GEOMETRY(geometry)},
     {"autofit", OPT_SIZE_BOX(autofit)},
@@ -216,6 +217,7 @@ const struct m_sub_options vo_sub_opts = {
         .native_fs = true,
         .taskbar_progress = true,
         .border = true,
+        .title_bar = true,
         .appid = "mpv",
         .content_type = -1,
         .WinID = -1,

options/options.h

@@ -16,6 +16,7 @@ typedef struct mp_vo_opts {
     int ontop_level;
     bool fullscreen;
     bool border;
+    bool title_bar;
     bool all_workspaces;
     bool window_minimized;
     bool window_maximized;