os: test failing with "UserHomeDir returned an empty string" in android arm*

[katiehockman]

Test failing with "UserHomeDir returned an empty string" for os_test.go

android-arm-wiko-fever example: https://build.golang.org/log/b6431bd0e1313cc39d46431f342111fe4cde48e2
android-arm64-wiko-fever example: https://build.golang.org/log/1d92326af70273d97688efad782360be76282295

go_android_exec: adb -d shell mkdir -p /data/local/tmp/os.test-72159
go_android_exec: adb -d push /var/folders/f6/d2bhfqss2716nxm8gkv1fmb80000gn/T/go-build368472441/b730/os.test /data/local/tmp/os.test-72159/os.test-72159-tmp
[  1%] /data/local/tmp/os.test-72159/os.test-72159-tmp
[  3%] /data/local/tmp/os.test-72159/os.test-72159-tmp
[  5%] /data/local/tmp/os.test-72159/os.test-72159-tmp
[  6%] /data/local/tmp/os.test-72159/os.test-72159-tmp
[  8%] /data/local/tmp/os.test-72159/os.test-72159-tmp
[ 10%] /data/local/tmp/os.test-72159/os.test-72159-tmp
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/var/folders/f6/d2bhfqss2716nxm8gkv1fmb80000gn/T/go-build368472441/b730/os.test: 1 file pushed. 7.6 MB/s (3810224 bytes in 0.477s)
go_android_exec: adb -d shell cp '/data/local/tmp/os.test-72159/os.test-72159-tmp' '/data/local/tmp/os.test-72159/os.test-72159'
go_android_exec: adb -d shell rm '/data/local/tmp/os.test-72159/os.test-72159-tmp'
go_android_exec: adb -d shell export TMPDIR="/data/local/tmp/os.test-72159"; export GOROOT="/data/local/tmp/goroot"; export GOPATH="/data/local/tmp/gopath"; cd "/data/local/tmp/goroot/src/os"; '/data/local/tmp/os.test-72159/os.test-72159' -test.short=true -test.timeout=9m0s; echo -n exitcode=$?
--- FAIL: TestUserHomeDir (0.00s)
    os_test.go:2340: UserHomeDir returned an empty string
FAIL
exitcode=1go_android_exec: adb -d shell rm -rf /data/local/tmp/os.test-72159
FAIL	os	1.969s

[katiehockman]

/cc @bradfitz @ianlancetaylor

[bradfitz]

Fixed by https://go-review.googlesource.com/c/go/+/139717