pgsql: Use thread-local storage for querybuffer in fmtId() on Windows,

Log Message:
-----------
Use thread-local storage for querybuffer in fmtId() on Windows, when needed (i.e. when
running pg_restore, which might run in parallel).
Only reopen archive file when we really need to read from it, in parallel code. Otherwise,
close it immediately in a worker, if possible.

Modified Files:
--------------
    pgsql/src/bin/pg_dump:
        dumputils.c (r1.44 -> r1.45)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/dumputils.c?r1=1.44&r2=1.45)
        dumputils.h (r1.23 -> r1.24)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/dumputils.h?r1=1.23&r2=1.24)
        pg_backup_archiver.c (r1.165 -> r1.166)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_backup_archiver.c?r1=1.165&r2=1.166)
        pg_restore.c (r1.94 -> r1.95)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_restore.c?r1=1.94&r2=1.95)