ruby3[23]: Fix build on 10.4 with gcc14.

[fhgwright]

This fixes a couple of issues that were warnings until gcc14 made them errors. At least one such issue probably would have caused a crash if the relevant code were executed.

This changes the installed content on 10.4, and hence gets a revbump.

TESTED:
Built successfully on OSX 10.4-10.5 ppc, 10.4-10.6 i386, 10.5-12.x x86_64, and 11.x-14.x arm64. Included all variants compatible with available dependencies on the respective platforms (except ppc builds, which were limited to default variants to save time).

Description

Type(s)

• bugfix
• enhancement
• security fix

Tested on

Mac OS X 10.4.11 8S165, PPC, Xcode 2.5 8M2558
Mac OS X 10.4.11 8S2167, i386, Xcode 2.5 8M2558
Mac OS X 10.5.8 9L31a, PPC, Xcode 3.1.4 9M2809
Mac OS X 10.5.8 9L31a, i386, Xcode 3.1.4 9M2809
Mac OS X 10.5.8 9L31a, x86_64, Xcode 3.1.4 9M2809
Mac OS X 10.6.8 10K549, i386, Xcode 3.2.6 10M2518
Mac OS X 10.6.8 10K549, x86_64, Xcode 3.2.6 10M2518
Mac OS X 10.7.5 11G63, x86_64, Xcode 4.6.3 4H1503
OS X 10.8.5 12F2560, x86_64, Xcode 5.1.1 5B1008
OS X 10.9.5 13F1911, x86_64, Xcode 6.2 6C131e
OS X 10.10.5 14F2511, x86_64, Xcode 7.2 7C68
OS X 10.11.6 15G22010, x86_64, Xcode 8.1 8B62
macOS 10.12.6 16G2136, x86_64, Xcode 9.2 9C40b
macOS 10.13.6 17G14042, x86_64, Xcode 10.1 10B61
macOS 10.14.6 18G9323, x86_64, Xcode 11.3.1 11C505
macOS 10.15.7 19H15, x86_64, Xcode 12.4 12D4e
macOS 11.7.10 20G1427, x86_64, Xcode 13.2.1 13C100
macOS 11.7.10 20G1427, arm64, Xcode 13.2.1 13C100
macOS 12.7.6 21H1320, x86_64, Xcode 14.2 14C18
macOS 12.7.6 21H1320, arm64, Xcode 14.2 14C18
macOS 13.7.2 22H313, arm64, Xcode 15.2 15C500b
macOS 14.7.2 23H311, arm64, Xcode 16.2 16C5032a
macOS 15.2 24C101, arm64, Xcode 16.2 16C5032a

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• [N/A] referenced existing tickets on Trac with full URL in commit message?
• checked your Portfile with port lint?
• [NO] tried existing tests with sudo port test? *
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?
• checked that the Portfile's most important variants haven't been broken?

* - The test framework has issues.

[macportsbot]

Notifying maintainers:
@kimuraw for port ruby32, ruby33.

[fhgwright]

This supersedes #27024, which should be closed.