pgsql: One more hack to see if we can get the cygwin machines building

Log Message:
-----------
One more hack to see if we can get the cygwin machines building again.
This continues the saga of trying to get PGDLLIMPORT to work in pg_crc.h
in both backend and frontend environments.

Modified Files:
--------------
    pgsql/src/bin/pg_resetxlog:
        pg_resetxlog.c (r1.68 -> r1.69)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_resetxlog/pg_resetxlog.c?r1=1.68&r2=1.69)