Fix runc exec vs go1.26 + older kernel #9213

Job	Run time
cross-i386	1m 1s
fedora	21m 9s
test (ubuntu-24.04, 1.25.x, -race, criu-dev)	8m 20s
test (ubuntu-24.04, 1.24.x)	6m 59s
test (ubuntu-24.04, 1.25.x, rootless, -race)	10m 25s
test (ubuntu-24.04, 1.25.x, rootless)	9m 23s
test (ubuntu-24.04, 1.26.0-rc.2, rootless)	10m 16s
test (ubuntu-24.04-arm, 1.25.x, rootless, -race)	8m 21s
test (ubuntu-24.04, 1.25.x, criu-dev)	8m 47s
test (ubuntu-24.04-arm, 1.25.x)	6m 10s
test (ubuntu-24.04-arm, 1.25.x, rootless)	8m 29s
test (ubuntu-24.04-arm, 1.25.x, -race, criu-dev)	6m 56s
test (ubuntu-24.04-arm, 1.25.x, criu-dev)	6m 12s
test (ubuntu-24.04-arm, 1.26.0-rc.2)	13m 2s
test (ubuntu-24.04-arm, 1.24.x, rootless)	7m 55s
test (ubuntu-24.04-arm, 1.26.0-rc.2, rootless)	8m 21s
test (ubuntu-24.04-arm, 1.25.x, -race)	6m 50s
test (ubuntu-24.04, 1.25.x, -race)	8m 19s
test (ubuntu-24.04-arm, 1.24.x)	5m 51s
test (ubuntu-24.04, 1.25.x)	7m 50s
test (ubuntu-24.04, 1.24.x, rootless)	9m 13s
test (ubuntu-24.04, 1.26.0-rc.2)	7m 12s
all-done	3s
	3h 7m 4s

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