main: add condition to isRootless()
main: add condition to isRootless()

Signed-off-by: Akihiro Suda <ea940da7e429af3d0d0c18296cabd0112a36bad5@lab.ntt.co.jp>

xiaochenshen/runc,rhatdan/runc,estesp/runc,opencontainers/runc,laijs/runc,mYmNeo/runc,estesp/runc,rhatdan/runc,wking/runc,cyphar/runc,crosbymichael/runc,mikebrow/runc,mheon/runc,mikebrow/runc,dqminh/runc,crosbymichael/runc,kolyshkin/runc,kolyshkin/runc,crosbymichael/runc,dqminh/runc,xiaochenshen/runc,dqminh/runc,justincormack/runc,kolyshkin/runc,justincormack/runc,mikebrow/runc,adrianreber/runc,laijs/runc,mYmNeo/runc,wking/runc,xiaochenshen/runc,laijs/runc,cyphar/runc,adrianreber/runc,mheon/runc,rhatdan/runc,wking/runc,adrianreber/runc,dqminh/runc,mheon/runc,opencontainers/runc,justincormack/runc,mYmNeo/runc,kolyshkin/runc,cyphar/runc,opencontainers/runc,estesp/runc,rhatdan/runc,opencontainers/runc