[vcpkg-tool-meson] Fixes for additional languages

[ajtribick]

• Changes comply with the maintainer guide.
• SHA512s are updated for each updated download.
• The "supports" clause reflects platforms that may be fixed by this new version, or no changes were necessary.
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• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
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Relevant: #51404 (but I can't check whether this actually fixes it)

• Match the template and variable names for Objective-C++
• Use ADDITIONAL_LANGUAGES parameter for vcpkg_cmake_get_vars

Please double-check this! In particular, I have absolutely no idea why the existing method of passing additional languages for Meson works with glib and not with harfbuzz! From what I can see based on local testing, using the ADDITIONAL_LANGUAGES parameter works for both.

Since I don't have any platforms that actually build the Objective-C/C++ code, I have verified this by the entries being created in the meson-${platform}-dbg.log files.

[BillyONeal]

@abique Can you confirm that this works? I'm reluctant to merge something for a bug for which we do not have a repro and we don't have a clear understanding of what happened.

[ajtribick]

It would also be useful to know whether this works with glib as well as harfbuzz.