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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Use "must not" instead of "cannot" wording

ext/pcntl: Use standard wording for ValueError

ext/pcntl: pcntl affinity improves EINVAL handling in both cases. (#13907)

also disable tests on travis.

ext/pcntl: cpu affinity api introduction.

For now, working on Linux, FreeBSD >= 13.x and DragonFlyBSD.
Handy wrapper to assign an array of cpu ids or to retrieve the cpu ids
assigned

ext/pcntl: cpu affinity api introduction.

For now, working on Linux, FreeBSD >= 13.x and DragonFlyBSD.
Handy wrapper to assign an array of cpu ids or to retrieve the cpu ids
assigned to a given process.

pcntl_setaffinity inserts valid unique cpu ids (within the range of available
cpus).

Close GH-13893

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