Move long_options structures to the top of main() functions, for

contrib/pg_test_fsync/pg_test_fsync.c

contrib/pg_test_timing/pg_test_timing.c

contrib/pgbench/pgbench.c

src/bin/pg_basebackup/pg_receivexlog.c

src/bin/pg_dump/pg_dumpall.c

src/test/regress/pg_regress.c