seltests/xsk: various improvements to xskxceiver #24583

Job	Run time
set-matrix	47s
build for x86_64 with gcc	4m 43s
build for x86_64 with llvm-16	4m 8s
build for aarch64 with gcc	4m 54s
build for s390x with gcc	15m 59s
veristat	2m 41s
test_progs on x86_64 with gcc	4m 50s
test_progs_parallel on x86_64 with gcc	3m 8s
test_progs_no_alu32 on x86_64 with gcc	3m 51s
test_progs_no_alu32_parallel on x86_64 with gcc	2m 42s
test_maps on x86_64 with gcc	2m 37s
test_verifier on x86_64 with gcc	1m 42s
test_progs on x86_64 with llvm-16	4m 39s
test_progs_parallel on x86_64 with llvm-16	3m 4s
test_progs_no_alu32 on x86_64 with llvm-16	3m 49s
test_progs_no_alu32_parallel on x86_64 with llvm-16	2m 48s
test_maps on x86_64 with llvm-16	2m 46s
test_verifier on x86_64 with llvm-16	1m 37s
test_progs on aarch64 with gcc	5m 35s
test_progs_parallel on aarch64 with gcc	3m 10s
test_progs_no_alu32 on aarch64 with gcc	4m 56s
test_progs_no_alu32_parallel on aarch64 with gcc	3m 13s
test_maps on aarch64 with gcc	3m 21s
test_verifier on aarch64 with gcc	1m 29s
test_progs on s390x with gcc	26m 55s
test_progs_no_alu32 on s390x with gcc	19m 29s
test_maps on s390x with gcc	1h 6m 10s
test_verifier on s390x with gcc	6m 29s
	3h 31m 32s

Provide feedback