Log LLVM library version in configure output.

When scanning build farm results, it's useful to be able to see which
version is in use.  For the Meson build system, this information was
already displayed.

Back-patch to all supported branches.

Discussion: https://postgr.es/m/4022690.1697852728%40sss.pgh.pa.us

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/5e4dacb9878cf71e32950e90993afd9450dab4da

Modified Files
--------------
config/llvm.m4 | 1 +
configure      | 2 ++
2 files changed, 3 insertions(+)

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