Fix for GCC 15 two-phase lookup

[SoapGentoo]

• GCC 15 is more aggressive about checking dependent names: https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=r15-2117-g313afcfdabeab3

Bug: https://bugs.gentoo.org/936522

Checklist

• [x] I have described the changes
• [x] I have linked to any relevant GitHub issues, if applicable
• [x] Documentation in doc/ has been updated
• [x] All new code is licensed under GPLv3

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