build(win): export extern symbols for use in FFI #22756

Makes `extern` variables accessible through ffi on Windows.

Follow-up to https://github.com/neovim/neovim/pull/15999

test/functional/lua/ffi_spec.lua

@@ -63,5 +63,14 @@ describe('ffi.cdef', function()
         nil
       )
     ]=])
+
+    -- Check that extern symbols are exported and accessible
+    eq(true, exec_lua[[
+      local ffi = require('ffi')
+
+      ffi.cdef('uint64_t display_tick;')
+
+      return ffi.C.display_tick >= 0
+    ]])
   end)
 end)