libct/system: rm Fexecve #7245

Job	Run time
cross-i386	1m 20s
test (ubuntu-20.04, 1.22.x, rootless, -race)	6m 53s
test (ubuntu-20.04, 1.22.x, rootless)	6m 55s
test (ubuntu-20.04, 1.22.x, -race)	7m 48s
test (ubuntu-20.04, 1.22.x)	6m 54s
test (ubuntu-20.04, 1.23.x, rootless, -race)	6m 56s
test (ubuntu-20.04, 1.23.x, rootless)	6m 51s
test (ubuntu-20.04, 1.23.x, -race)	7m 34s
test (ubuntu-20.04, 1.23.x)	7m 6s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 49s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 15s
test (ubuntu-24.04, 1.22.x, rootless)	9m 20s
test (ubuntu-24.04, 1.22.x, -race)	7m 29s
test (ubuntu-24.04, 1.22.x)	6m 44s
test (ubuntu-24.04, 1.23.x, rootless, -race)	9m 37s
test (ubuntu-24.04, 1.23.x, rootless)	10m 50s
test (ubuntu-24.04, 1.23.x, -race)	8m 4s
test (ubuntu-24.04, 1.23.x)	7m 29s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 54s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 35s
test (actuated-arm64-6cpu-8gb, 1.23.x)	7m 55s
all-done	1s
	2h 42m 19s

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