Ignore file flag bits that we don't support.  In particular, this corrects a segfault seen when archiving files from NTFS (which sets bits in st_flags that are not documented in <sys/stat.h>.)
Ignore file flag bits that we don't support.  In particular, this
corrects a segfault seen when archiving files from NTFS (which sets
bits in st_flags that are not documented in <sys/stat.h>.)

Thanks to: Doug Rabson

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