Android: Require Clang 18 for -std=c++23

Update the Clang version checks added by

* commit eacacc70fc (Clang: use -std=c++23 for Clang 17.0+,
                     2023-05-08, v3.27.0-rc1~115^2)
* commit 0183956d30 (Clang: C++26 support,
                     2023-05-16, v3.27.0-rc1~85^2)

to account for Android NDK r26's distribution of a Clang based on a
development version of LLVM/Clang 17.0 that pre-dated addition of
these flags.

Follow the pattern from commit 12e6796b62 (Android: Do not pass
non-existent Clang -std flags, 2018-04-02, v3.12.0-rc1~284^2),
which fixed the same problem for `-std=c++17`.

Fixes: #25281

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