os: problem with Readlink on baremetal

[deadprogram]

For some reason there is a new failure in the smoke tests for the TinyGo driver's repo, I think is probably in some way due to the implementation in PR #2529

The error is:

tinygo build -size short -o ./build/test.hex -target=wioterminal ./examples/rtl8720dn/webclient/
go: downloading golang.org/x/net v0.0.0-20210614182718-04defd469f4e
go: downloading golang.org/x/text v0.3.6
# path/filepath
/usr/local/go/src/path/filepath/symlink.go:103:19: Readlink not declared by package os
make: *** [Makefile:208: smoke-test] Error 1

https://app.circleci.com/pipelines/github/tinygo-org/drivers/1104/workflows/c928d9b8-975a-4915-bae9-67ce62e940df/jobs/1139?invite=true#step-105-400

[dkegel-fastly]

Reproducible without drivers repo using by building path/filepath test for bare metal target, I think, e.g.

tinygo test -c -target=pybadge path/filepath
# path/filepath
/usr/local/go/src/path/filepath/symlink.go:103:19: Readlink not declared by package os

[deadprogram]

Confirmed on my machine:

$ tinygo test -c -target=pybadge path/filepath
# path/filepath
/home/ron/.gvm/gos/go1.17.5/src/path/filepath/symlink.go:103:19: Readlink not declared by package os
FAIL

[dkegel-fastly]

Fix with proper test coming tonight.

[dkegel-fastly]

#2565 should sort this.

[deadprogram]

Drivers build went green thanks to you @dkegel-fastly so now closing.