Annotate absolutePath in std/path.d to please dlang/dmd#12520

[nordlow]

Follow-up to #8106 to see if the same linker-error triggered by #8090 happens again. IRC, the linker error was caused by picking a symbol with incorrect mangling of absolutePath.

As

echo _D3std4path12absolutePathFNaNfAyaLQeZQh | ddemangle

prints

pure @safe immutable(char)[] std.path.absolutePath(immutable(char)[], lazy immutable(char)[])

it seems the error was caused by the CI, for some unknown reason, not linking with the recently built version of phobos.

Previous try was reverted via #8103.

[dlang-bot]

Thanks for your pull request and interest in making D better, @nordlow! We are looking forward to reviewing it, and you should be hearing from a maintainer soon.
Please verify that your PR follows this checklist:

• My PR is fully covered with tests (you can see the coverage diff by visiting the details link of the codecov check)
• My PR is as minimal as possible (smaller, focused PRs are easier to review than big ones)
• I have provided a detailed rationale explaining my changes
• New or modified functions have Ddoc comments (with Params: and Returns:)

Please see CONTRIBUTING.md for more information.

---

If you have addressed all reviews or aren't sure how to proceed, don't hesitate to ping us with a simple comment.

Bugzilla references

Your PR doesn't reference any Bugzilla issue.

If your PR contains non-trivial changes, please reference a Bugzilla issue or create a manual changelog.

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + phobos#8107"

[thewilsonator]

cc @ibuclaw

[nordlow]

Green now. Shall we try again, @ibuclaw?

[nordlow]

This annotation of absolutePath accidentally sneaked in via

https://github.com/dlang/phobos/pull/8085/files

. Sorry for that. Let's hope the previous linker error was intermittent. FYI, @ibuclaw