* [0605107]->[d9883ac] setlocale: Enable replacement on Cygwin 1.5.
* [d3e6271]->[] sys_select: Ensure memset is declared also on AIX 7.
* [c00787b]->[11da7a4] setenv: Avoid gcc warning.
+ * [6f88ff3]->[4c509f3] unsetenv: Avoid gcc warning.
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