Describe how libev is modified for audit #431

Job	Run time
build-and-test (fedora:latest, clang)	1m 29s
build-and-test (ubuntu:latest, clang)	1m 24s
build-and-test (fedora:latest, gcc)	1m 57s
build-and-test (ubuntu:latest, gcc)	1m 18s
	6m 8s

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