Fix validate issue if segment size greater than 4GB. #638
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If we use segsize>4GB, e.g.
./configure --prefix=/store2/Workspace/bin/pg16 --enable-debug --with-segsize=5 CFLAGS=-O2
the backup or restore will be failed in the validate step:
The reason is the block and pos parameter in struct BackupPageHeader2 declared as int32, and when datafile exceed 4G, the variables will overflow.
This patch fixed this issue.