eclass/toolchain: sync with gx86 · gentoo/prefix@0d1ac11

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The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

Use "$@" (with quotes) to prevent whitespace problems.

Use 'pushd ... || exit' or 'pushd ... || return' in case pushd fails.

Use 'popd ... || exit' or 'popd ... || return' in case popd fails.

Declare and assign separately to avoid masking return values.

isgcc appears unused. Verify use (or export if used externally).

Declare and assign separately to avoid masking return values.

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