Error Linking LTO programs using GCC6.4

[叶雨飞]

This is actually not the same issue at
https://cygwin.com/ml/cygwin/2017-09/msg00236.html

In my case, it is caused by latest binutils 2.28 , when using 2.25
everything is fine (even with gcc-6.4)

Maybe we should hold back upgrading binutils , or maybe it need a more
recent version? There seems to be binutils 2.29.1 now

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