[Fix] gracefully handle GNU tar on MacOS during `nvm install` #1089

Job	Run time
shellcheck_matrix (bash, nvm.sh)	52s
shellcheck_matrix (sh, nvm.sh)	47s
shellcheck_matrix (dash, nvm.sh)	48s
shellcheck_matrix (ksh, nvm.sh)	39s
shellcheck_matrix (bash, install.sh)	26s
shellcheck_matrix (bash, bash_completion)	21s
shellcheck_matrix (bash, nvm-exec)	22s
shellcheck	7s
	4m 22s

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