UseSWIG: fix regression for PHP language
Refactoring in !1707 (merged) accidentally regressed support for PHP. Fix it.
Fixes: #18421 (closed)
Topic-rename: UseSWIG-php-regression
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Refactoring in !1707 (merged) accidentally regressed support for PHP. Fix it.
Fixes: #18421 (closed)
Topic-rename: UseSWIG-php-regression