Fix crashes on macOS, and updates for macOS Sierra and newer#47

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mouse07410 wants to merge 4 commits intotbuktu:masterfrom mouse07410:master

+23-9

Commits on Aug 18, 2020

Fix a bug that crashes any app using this lib on macOS
Uri Blumenthal
committed
macOS dynamic libraries have extension .dylib, not .so
Uri Blumenthal
committed
macOS starting with 10.12 Sierra (year 2016) supports clock_gettime()
Uri Blumenthal
committed
On macOS it is not allowed to install into /usr (OS protection). Must have a
Uri Blumenthal
committed