Fix build with Boost 1.89.0

[cho-m]

Issue

Fixes #7219

Used __has_include (since C++20 standard) though alternative would be BOOST_VERSION < 108900

Tasklist

• CHANGELOG.md entry (How to write a changelog entry)
• update relevant Wiki pages
• add tests (see testing documentation)
• review
• adjust for comments

Requirements / Relations

None

[DennisOSRM]

consider also bumping the dependency.

[cho-m]

consider also bumping the dependency.

Where are you referring to?

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If CI, it doesn't look like MarkusJx/install-boost@v2 has 1.89.0 yet - https://github.com/MarkusJx/prebuilt-boost/blob/main/versions-manifest.json#L1881

osrm-backend/.github/workflows/osrm-backend.yml

Line 431 in c467cdf

boost_version: 1.85.0

and same thing for Conan: https://conan.io/center/recipes/boost?version=1.88.0

osrm-backend/conanfile.py

Line 9 in c467cdf

self.requires("boost/1.85.0")

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For code, it should be backwards compatible as far as I can tell, so there shouldn't be any increase in minimum required Boost.

[DennisOSRM]

Thx for the clarification. Looks fine to merge as is and to bump the dependencies when they become available.