runtime: TestCgoExecSignalMask failures

[gopherbot]

#!watchflakes
post <- pkg == "runtime" && test == "TestCgoExecSignalMask"

Issue created automatically to collect these failures.

Example (log):

--- FAIL: TestCgoExecSignalMask (0.00s)
    crash_cgo_test.go:137: /opt/golang/tmp/workdir-host-solaris-oracle-amd64-oraclerel/tmp/go-build3722635515/testprogcgo.exe CgoExecSignalMask failed to start: context deadline exceeded

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "runtime" && test == "TestCgoExecSignalMask"

2023-04-11 20:25 solaris-amd64-oraclerel go@28480216 runtime.TestCgoExecSignalMask (log)

--- FAIL: TestCgoExecSignalMask (0.00s)
    crash_cgo_test.go:137: /opt/golang/tmp/workdir-host-solaris-oracle-amd64-oraclerel/tmp/go-build3722635515/testprogcgo.exe CgoExecSignalMask failed to start: context deadline exceeded

— watchflakes

[bcmills]

Duplicate of #60152.