Changes since version 1.38.0:

* test: use last matching qemu version (cjihrig)

* win, util: rearrange uv_hrtime (Bartosz Sosnowski)

* test: skip signal_multiple_loops test on QEMU (gengjiawen)

* build: add android build to CI (gengjiawen)

* test: extend fs_event_error_reporting timeout (cjihrig)

* build: link libkvm on netbsd only (Alexander Tokmakov)

* linux: refactor /proc file reader logic (Ben Noordhuis)

* linux: read load average from /proc/loadavg (Ben Noordhuis)

* android: remove patch code for below 21 (gengjiawen)

* win: fix visual studio 2008 build (Arenoros)

* win,tty: fix deadlock caused by inconsistent state (lander0s)

* unix: use relaxed loads/stores for feature checks (Ben Noordhuis)

* build: don't .gitignore m4/ax_pthread.m4 (Ben Noordhuis)

* unix: fix gcc atomics feature check (Ben Noordhuis)

* darwin: work around clock jumping back in time (Ben Noordhuis)

* udp: fix write_queue cleanup on sendmmsg error (Santiago Gimeno)

* src: build fix for Android (David Carlier)