[FFe] libgcrypt: FTBFS on s390x due to failed tests

On s390x, libgcrypt20 FTBFS because the testsuite that runs at build-time fails.

This was spotted during a test rebuild ( https://people.canonical.com/~ginggs/ftbfs-report/test-rebuild-20240912-oracular-oracular.html ).

The log for the issue on s390x is at https://launchpadlibrarian.net/751878684/buildlog_ubuntu-oracular-s390x.libgcrypt20_1.11.0-6_BUILDING.txt.gz

The error is below:

computed: a0 12 f9 83 af cb 5e 36 37 4e 5f db a8 e7 5e 5d 08 d3 a6 fe 7a a7 f0 9d ed e0 12 3b 90 4e 55 f6
expected: c1 c3 69 25 b6 40 9a 04 f1 b5 04 fc bc a9 d8 2b 40 17 27 7c b5 ed 2b 20 65 fc 1d 38 14 d5 aa f5
basic: algo 329, digest mismatch
computed: a0 12 f9 83 af cb 5e 36 37 4e 5f db a8 e7 5e 5d 08 d3 a6 fe 7a a7 f0 9d ed e0 12 3b 90 4e 55 f6
expected: c1 c3 69 25 b6 40 9a 04 f1 b5 04 fc bc a9 d8 2b 40 17 27 7c b5 ed 2b 20 65 fc 1d 38 14 d5 aa f5
basic: check_one_md_multi: algo 329, digest mismatch
computed: 85 dc 9c ca a6 6f ab fb 94 17 cd 64 2d 53 ff b7 f2 30 ed 70 87 5c 69 e1 79 ab 72 1d 78 95 c7 e5
expected: c5 22 1d 50 e4 f8 22 d9 6a 2e 88 81 a9 61 42 0f 29 4b 7b 24 fe 3d 20 94 ba ed 2c 65 24 cc 16 6b
basic: algo 329, digest mismatch
computed: 85 dc 9c ca a6 6f ab fb 94 17 cd 64 2d 53 ff b7 f2 30 ed 70 87 5c 69 e1 79 ab 72 1d 78 95 c7 e5
expected: c5 22 1d 50 e4 f8 22 d9 6a 2e 88 81 a9 61 42 0f 29 4b 7b 24 fe 3d 20 94 ba ed 2c 65 24 cc 16 6b
basic: check_one_md_multi: algo 329, digest mismatch
computed: 33 dc 74 56 44 a8 0e 6b de 40 80 75 86 b4 86 4c 6c af d7 81 4e 7e bc a7 55 7a 48 ab c8 09 ba ba 1d a2 bc 5f ca 0b f7 9f ba b7 01 4a f2 1f 80 7b 7a a6 cd 0a c0 52 6c 1c 60 a0 6b f7 a8 3a 07 4c
expected: d0 08 82 8e 2b 80 ac 9d 22 18 ff ee 1d 07 0c 48 b8 e4 c8 7b ff 32 c9 69 9d 5b 68 96 ee e0 ed d1 64 02 0e 2b e0 56 08 58 d9 c0 0c 03 7e 34 a9 69 37 c5 61 a7 4c 41 2b b4 c7 46 46 95 27 28 1c 8c
basic: algo 330, digest mismatch
computed: 33 dc 74 56 44 a8 0e 6b de 40 80 75 86 b4 86 4c 6c af d7 81 4e 7e bc a7 55 7a 48 ab c8 09 ba ba 1d a2 bc 5f ca 0b f7 9f ba b7 01 4a f2 1f 80 7b 7a a6 cd 0a c0 52 6c 1c 60 a0 6b f7 a8 3a 07 4c
expected: d0 08 82 8e 2b 80 ac 9d 22 18 ff ee 1d 07 0c 48 b8 e4 c8 7b ff 32 c9 69 9d 5b 68 96 ee e0 ed d1 64 02 0e 2b e0 56 08 58 d9 c0 0c 03 7e 34 a9 69 37 c5 61 a7 4c 41 2b b4 c7 46 46 95 27 28 1c 8c
basic: check_one_md_multi: algo 330, digest mismatch
computed: a3 14 9a 0a 85 d1 f3 41 94 04 ba 8f cf a8 1a 27 b0 02 ae cc 93 4b 8b 3c d3 bf 79 de 22 63 33 51 38 8b f5 ba a6 74 52 d5 b3 56 f4 38 df 6f dc 4e 44 5c c7 cb a7 5e 5b 3d 86 bd 1f 97 ac 4f 8c 1a
expected: 07 dc 27 b1 1e 51 fb ac 75 bc 7b 3c 1d 98 3e 8b 4b 85 fb 1d ef af 21 89 12 ac 86 43 02 73 09 17 27 f4 2b 17 ed 1d f6 3e 8e c1 18 f0 4b 23 63 3c 1d fb 15 74 c8 fb 55 cb 45 da 8e 25 af b0 92 bb
basic: algo 330, digest mismatch
computed: a3 14 9a 0a 85 d1 f3 41 94 04 ba 8f cf a8 1a 27 b0 02 ae cc 93 4b 8b 3c d3 bf 79 de 22 63 33 51 38 8b f5 ba a6 74 52 d5 b3 56 f4 38 df 6f dc 4e 44 5c c7 cb a7 5e 5b 3d 86 bd 1f 97 ac 4f 8c 1a
expected: 07 dc 27 b1 1e 51 fb ac 75 bc 7b 3c 1d 98 3e 8b 4b 85 fb 1d ef af 21 89 12 ac 86 43 02 73 09 17 27 f4 2b 17 ed 1d f6 3e 8e c1 18 f0 4b 23 63 3c 1d fb 15 74 c8 fb 55 cb 45 da 8e 25 af b0 92 bb
basic: check_one_md_multi: algo 330, digest mismatch
FAIL: basic

Also note the following success:

      now running 'basic' test with all hardware features disabled.
PASS: basic-disable-all-hwf

This comes from trying to use a CPU acceleration feature for SHA3 for cSHAKE which is based on SHA3 but slightly different. There is a patch upstream to stop trying to use the SHA3 acceleration for that.

The patch is limited to s390x, simple, already upstream and merged: https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=2486d9b5ae015c1786cb84466a751da4bc0d7122