GHA/linux: build -O3 job with unity batches to save 10s
#18293
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This reverts commit 73c8d91. Practically no improvement.
-O3 job with unity batches to save 10s
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Before:
https://github.com/curl/curl/actions/runs/16974205126/job/48118716664 25s, 12m56
https://github.com/curl/curl/actions/runs/16973102133/job/48114977897 24s, 12m51
After:
https://github.com/curl/curl/actions/runs/16977392119/job/48129665222?pr=18293 15s, 13m1
https://github.com/curl/curl/actions/runs/16982920995/job/48146455731?pr=18293 15s, 12m59
(hard to say if there is a measurable test runtime perf reduction
with batches enabled. and if it offsets the gain on build time.)
Enabling batches for all cmake jobs did minimal (1s) if any
improvement on other jobs.