spawnSync tests on arm64 in ci job were failed with TIMEOUT in
https://jenkins-iojs.nodesource.com/job/iojs+any-pr+multi/nodes=iojs-armv8-ubuntu1404/234/console
and related tests using spawnSync were also failed as discussed in #1028 .

CC: @bnoordhuis