r33876. [ruby-core:41475] [Bug #5706]
* ext/socket/extconf.rb: the alternative hack for [Bug #5675].
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calls with zero arguments can be substituted. aliasing in .def
file has no effect for static library. [ruby-core:41370]
[Bug#5681]
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* include/ruby/missing.h: don't substitute "close", etc. here.
* include/ruby/ruby.h: include ruby/subst.h at last.
This prevents substituting "close" in unitstd.h.
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