pgsql: Use --strip-unneeded when stripping static libraries with GNU st

Use --strip-unneeded when stripping static libraries with GNU strip.

We've long used "--strip-unneeded" for shared libraries but plain
"-x" for static libraries when stripping symbols with GNU strip.
There doesn't seem to be any really good reason for that though,
since --strip-unneeded produces smaller output (as "-x" alone
does not remove debug symbols). Moreover it seems that
llvm-strip, although it identifies as GNU strip, misbehaves when
given "-x" for this purpose. It's unclear whether that's
intentional or a bug in llvm-strip, but in any case it seems like
changing to use --strip-unneeded in all cases should be a win.

Note that this doesn't change our behavior when dealing with
non-GNU strip.

Per gripes from Ed Maste and Palle Girgensohn. Back-patch,
in case anyone wants to use llvm-strip with stable branches.

Discussion: https://postgr.es/m/17898-5308d09543463266@postgresql.org
Discussion: https://postgr.es/m/20230420153338.bbj2g5jiyy3afhjz@awork3.anarazel.de

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/eab2d3147e3c13aca4a9aca52c0a9a581a8d224a

Modified Files
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config/programs.m4 | 2 +-
configure | 2 +-
src/makefiles/meson.build | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)