pgsql: Fix pg_restore to guard against unexpected EOF while reading an

Log Message:
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Fix pg_restore to guard against unexpected EOF while reading an archive file.
Per report and partial patch from Chad Wagner.

Tags:
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REL8_1_STABLE

Modified Files:
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    pgsql/src/bin/pg_dump:
        pg_backup_archiver.c (r1.117.2.4 -> r1.117.2.5)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_backup_archiver.c.diff?r1=1.117.2.4&r2=1.117.2.5)
        pg_backup_custom.c (r1.33 -> r1.33.2.1)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_backup_custom.c.diff?r1=1.33&r2=1.33.2.1)
        pg_backup_files.c (r1.27 -> r1.27.2.1)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_backup_files.c.diff?r1=1.27&r2=1.27.2.1)
        pg_backup_tar.c (r1.49.2.3 -> r1.49.2.4)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_backup_tar.c.diff?r1=1.49.2.3&r2=1.49.2.4)