tools: temporarily unset LD_LIBRARY_PATH when generating ssh key #19080

Job	Run time
aux	4m 0s
race	7m 23s
race_dashboard	2m 49s
build	3m 9s
dashboard	2m 25s
old	7m 32s
gvisor	4m 10s
arch (presubmit_arch_netbsd)	3m 53s
arch (presubmit_arch_windows)	3m 39s
arch (presubmit_arch_executor)	3m 24s
arch (presubmit_arch_openbsd)	3m 52s
arch (presubmit_arch_linux)	10m 47s
arch (presubmit_arch_freebsd)	6m 39s
arch (presubmit_arch_darwin)	3m 50s
	1h 7m 32s

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