fix(ci): unblock Windows xmake test link (LNK1561)

xmake's gtest package defaults to `gmock = true`, so with `main = true`
it links `gmock_main.lib` (not `gtest_main.lib`). On Windows, MSVC's
linker doesn't scan inside static libs for the entry point, so it
reports `LNK1561: entry point must be defined`.

- Disable gmock — we don't use it; this switches the linked main
  archive to `gtest_main.lib`.
- Add `/WHOLEARCHIVE:gtest_main.lib` on Windows to force the entry
  point object into the link, side-stepping MSVC's lazy lib resolution.

Author: Sunrisepeak

tests/xmake.lua

@@ -1,11 +1,16 @@
 add_rules("mode.debug", "mode.release")
 set_languages("c++23")
 
-add_requires("gtest", { configs = { main = true } })
+add_requires("gtest", { configs = { main = true, gmock = false } })
 
 target("cmdline_test")
     set_kind("binary")
     add_files("cmdline_test.cpp")
     add_deps("cmdline")
     add_packages("gtest")
     set_policy("build.c++.modules", true)
+    -- MSVC 不会从静态库扫描入口点，需要 /WHOLEARCHIVE 把 gtest_main.lib
+    -- 强制整体链入，否则报 LNK1561: entry point must be defined。
+    if is_plat("windows") then
+        add_ldflags("/wholearchive:gtest_main.lib", { force = true })
+    end