It was reported that uv_get_free_memory() and uv_get_total_memory()
report the wrong values inside an lxc container.
Libuv calls sysinfo(2) but that isn't intercepted by lxc. /proc/meminfo
however is because /proc is a FUSE fs inside the container.
This commit makes libuv try /proc/meminfo first and fall back to
sysinfo(2) in case /proc isn't mounted.
Fixes: https://github.com/libuv/libuv/issues/2249
PR-URL: https://github.com/libuv/libuv/pull/2258
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
3a1be72532