Enable rej_uniform native implementation in x86_64 #2672

Job	Run time
Linting (ubuntu-latest)	1m 25s
Compiler tests (aarch64)	21s
Quickcheck (aarch64)	1m 16s
Quickcheck (x86_64)	49s
Compiler tests (x86_64)	1m 23s
Functional tests (MacOS)	2s
Functional tests (ubuntu-latest (aarch64))	4s
Functional tests (ubuntu-latest (x86_64))	6s
cbmc_k4 / Start CBMC (MLKEM-1024) (c7g.2xlarge)	3s
cbmc_k2 / Start CBMC (MLKEM-512) (c7g.2xlarge)	6s
cbmc_k3 / Start CBMC (MLKEM-768) (c7g.2xlarge)	3s
Functional tests (AMD EPYC 4th gen (t3a)) / Start AMD EPYC 4th gen (t3a) (t3a.small)	1s
Functional tests (Graviton2 (c6g.medium)) / Start Graviton2 (c6g.medium) (c6g.medium)	1s
Functional tests (Graviton3 (c7g.medium)) / Start Graviton3 (c7g.medium) (c7g.medium)	1s
Functional tests (Intel Xeon 4th gen (t3)) / Start Intel Xeon 4th gen (t3) (t3.small)	1s
Functional tests (AMD EPYC 4th gen (t3a)) / tests	1s
cbmc_k4 / tests	1s
cbmc_k3 / tests	1s
Functional tests (AMD EPYC 4th gen (t3a)) / Stop AMD EPYC 4th gen (t3a) (t3a.small)	7s
Functional tests (Intel Xeon 4th gen (t3)) / tests	1s
cbmc_k4 / Stop CBMC (MLKEM-1024) (c7g.2xlarge)	8s
cbmc_k3 / Stop CBMC (MLKEM-768) (c7g.2xlarge)	4s
Functional tests (Intel Xeon 4th gen (t3)) / Stop Intel Xeon 4th gen (t3) (t3.small)	7s
Functional tests (Graviton3 (c7g.medium)) / tests	1s
Functional tests (Graviton2 (c6g.medium)) / tests	1s
Functional tests (Graviton3 (c7g.medium)) / Stop Graviton3 (c7g.medium) (c7g.medium)	3s
Functional tests (Graviton2 (c6g.medium)) / Stop Graviton2 (c6g.medium) (c6g.medium)	2s
cbmc_k2 / tests	1s
cbmc_k2 / Stop CBMC (MLKEM-512) (c7g.2xlarge)	3s
	6m 23s

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