Remove Travis artefacts (#15714)

Travis was suspended https://github.com/php/php-src/pull/15314

This removes 404 errored Travis image in README, travis configuration
directory a

Remove Travis artefacts (#15714)

Travis was suspended https://github.com/php/php-src/pull/15314

This removes 404 errored Travis image in README, travis configuration
directory and YAML file and usages in tests.

[skip ci]

Co-authored-by: Gina Peter Banyard <girgias@php.net>

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Fix false positive test failure

ext/pcntl: adding pcntl_getcpu.

using sched_getcpu under the hood (Linux and FreeBSD).
Returns the current cpu id for the current process.
For Linux, we need to see beyond the sole p

ext/pcntl: adding pcntl_getcpu.

using sched_getcpu under the hood (Linux and FreeBSD).
Returns the current cpu id for the current process.
For Linux, we need to see beyond the sole presence of the symbol
to consider it.
Mostly useful, for now, in the cpu affinity context since
the os can migrate processes as it sees fits otherwise.

Clos GH-13908

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