2018.04.23, Version 1.20.2 (Stable)

Changes since version 1.20.1:

* zos: use custom semaphore (jBarz)

* win: fix registry API error handling (Kyle Farnung)

* build: add support for 64-bit AIX (Richard Lau)

* aix: guard STATIC_ASSERT for glibc work around (Richard Lau)
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