Ignore posix_istatty warnings
merged branch norzechowicz/posix_isatty (PR #8939)

This PR was submitted for the master branch but it was merged into the 2.2 branch instead (closes #8939).

Discussion
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[Console] Ignore posix_istatty warnings

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| License       | MIT

When input stream is ``php://memory`` or ``php://temp`` function ``posix_isatty`` throws following warning

> posix_isatty(): could not use stream of type 'MEMORY' in ....

Commits
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cc255dd Ignore posix_istatty warnings