[Patch] libstdc++/29989

[Paolo Carlini]

Hi,

this PR is really a duplicate of 23273, but in my opinion calls for the 
below patchlet: std::max and std::min are not special and we are not 
supposed to undef anything before introducing the definitions. In fact, 
the presence of the undefs may mislead the users to believe that before 
other std names (all of them?!?) undefs are also needed, as happened in 
the PR at issue.

Tested x86-linux, will wait until tomorrow.

Paolo.

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