libct/system: rm Fexecve #7246

Job	Run time
cross-i386	1m 28s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 16s
test (ubuntu-20.04, 1.22.x, rootless)	6m 45s
test (ubuntu-20.04, 1.22.x, -race)	7m 39s
test (ubuntu-20.04, 1.22.x)	6m 57s
test (ubuntu-20.04, 1.23.x, rootless, -race)	6m 59s
test (ubuntu-20.04, 1.23.x, rootless)	6m 50s
test (ubuntu-20.04, 1.23.x, -race)	7m 46s
test (ubuntu-20.04, 1.23.x)	7m 0s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 46s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 50s
test (ubuntu-24.04, 1.22.x, rootless)	9m 33s
test (ubuntu-24.04, 1.22.x, -race)	8m 24s
test (ubuntu-24.04, 1.22.x)	6m 42s
test (ubuntu-24.04, 1.23.x, rootless, -race)	9m 39s
test (ubuntu-24.04, 1.23.x, rootless)	9m 23s
test (ubuntu-24.04, 1.23.x, -race)	8m 0s
test (ubuntu-24.04, 1.23.x)	7m 14s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 48s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 39s
test (actuated-arm64-6cpu-8gb, 1.23.x)	7m 49s
all-done	1s
	2h 42m 28s

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