Flaky test (cygwin)

[bnoordhuis]

build/qjs tests/test_std.js
Error: assertion failed: got |0|, expected |3|
    at assert (tests/test_std.js:20)
    at test_os_exec (tests/test_std.js:249)
    at <anonymous> (tests/test_std.js:270)

Which is this line:

assert(status & 0x7f, os.SIGQUIT);