ci: macos: Remove use of -Dsegsize_blocks=6

The option causes a measurable slowdown. Macos is, by far, the most expensive
platform for CI, therefore it doesn't make sense to run such a test there.

d3b111e3205 used a small segment size for two tasks, one with autoconf, one
with meson. In hindsight that is a bit overkill, it's unlikely that the option
would silently break. Thus don't move the -Dsegsize_blocks=6, just remove
it. I did however change the autoconf test to use 6 instead of 8 blocks, as
long as we allow it, a non-power-of-two test seems like a good idea.

While at it, add a comment explaining why we use a small segment size for CI.

Author: Andres Freund <[email protected]>
Reviewed-by: Heikki Linnakangas <[email protected]>
Discussion: 
https://postgr.es/m/[email protected]
Backpatch: 16-, where d3b111e3205 introduced the use of -Dsegsize_blocks=6

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/2243ef8dd6fbe1f4ae3ffc7db1ee9af9427ecadb

Modified Files
--------------
.cirrus.yml | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

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