sys/targets: increase DataOffset for 64bit builds #15553

Job	Run time
dashboard	2m 18s
aux	3m 45s
build	4m 37s
gvisor	3m 14s
arch (presubmit_arch_linux)	9m 43s
old	6m 17s
race	7m 46s
arch (presubmit_arch_freebsd)	5m 48s
race_dashboard	3m 45s
arch (presubmit_arch_netbsd)	3m 35s
arch (presubmit_arch_openbsd)	3m 32s
arch (presubmit_arch_darwin)	3m 31s
arch (presubmit_arch_windows)	3m 36s
arch (presubmit_arch_executor)	3m 9s
	1h 4m 36s

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