protections for install

[Marc Girod]

Hi!

I just installed tramp-2.0.35, and found that the default protections
got from extracting the tar didn't allow me to build with my own
account, and install as root (with or without sudo), since my home
directory is nfs mounted from a storage server not trusting my root
account over nfs.

Thus, the missing of o+r on files and o+rx on directories went in the
way.

I don't expect my configuration to be specially weird or infrequent.

Best Regards!
Marc

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