Add ChangeLog.d entry for PR3421

Signed-off-by: nia <[email protected]>
Mbed-TLS · Jun 11, 2020 · ecef1dd · ecef1dd
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diff --git a/ChangeLog.d/bugfix_PR3421.txt b/ChangeLog.d/bugfix_PR3421.txt
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+Bugfix
+   * Set _POSIX_C_SOURCE to at least 200112L in C99 code. Reported in #3420 and fix submitted in #3421 by Nia Alarie.