[Bug-tar] Configure option to use umask when extracting as root

[Robert Connolly]

Hello. The attached patch adds a --disable-default-root-preserve configure 
option, so root does not preserve file mode or ownership when extracting. The 
current behavior is not effected by this patch, unless the configure option 
is used.

The purpose of this patch is not to remove the current behavior, but just to 
make it optional.

robert

tar-1.19-no_preserve.patch
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pgp5u9Fy4_XKs.pgp
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