Fix incremental compilation for .def files

[star-hengxing]

Fix #4898

[waruqi]

这么搞不行，即使 .def 每次都不改，也会重新 link 的

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This won't work. Even if .def is not changed every time, it will be linked again.

[star-hengxing]

没啥思路，也许应该弄一个新 api，给 target 添加依赖文件？

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I have no idea. Maybe I should create a new API and add dependency files to the target?

[waruqi]

暂时没想到更好的通用接口，暂时用 target:data_add("linkdepfiles", sourcefile) rule 的内部接口配置，后面想办法再改进。

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I haven't thought of a better general interface for the time being. I will use the internal interface configuration of target:data_add("linkdepfiles", sourcefile) rule for the time being, and I will think of ways to improve it later.