also add `BOOST_UNORDERED_DISABLE_NEON` for users of libtester #1545

Job	Run time
Discover Versions	2s
Platform Cache / Discover Platforms	8s
Platform Cache / Build Platforms (none)	2s
Run Build Workflow / Build spring (reproducible)	6m 54s
Run Build Workflow / Build spring (asserton)	7m 45s
Run Build Workflow / Build spring (ubuntu20)	9m 31s
Run Build Workflow / Build spring (ubuntu22)	8m 42s
Run Build Workflow / Build spring (asan)	10m 53s
Run Build Workflow / Build spring (ubsan)	10m 4s
LR Tests (ubuntu20)	24m 23s
LR Tests (ubuntu22)	24m 7s
Build deb packages (ubuntu20)	12m 20s
NP Tests (ubuntu20)	7m 18s
LR Tests (asserton)	24m 11s
Tests (ubuntu20)	3m 54s
Build deb packages (ubuntu22)	11m 43s
NP Tests (ubuntu22)	6m 24s
Tests (ubuntu22)	3m 57s
LR Tests (ubsan)	26m 37s
NP Tests (asserton)	6m 44s
Build deb packages (reproducible)	6m 47s
Tests (asserton)	3m 32s
LR Tests (ubuntu20repro)	24m 23s
NP Tests (ubsan)	9m 57s
Tests (ubsan)	4m 37s
LR Tests (ubuntu22repro)	24m 16s
NP Tests (ubuntu20repro)	7m 14s
Tests (asan)	7m 20s
NP Tests (ubuntu22repro)	6m 17s
Tests (ubuntu20repro)	3m 38s
Tests (ubuntu22repro)	3m 57s
libtester tests (ubuntu22, build-tree)	8m 29s
libtester tests (ubuntu22, make-dev-install)	8m 27s
libtester tests (ubuntu22, deb-install)	4m 34s
All Required Tests Passed	1s
	5h 29m 8s

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