Log Message:
-----------
Give a better error message when trying to change
"effective_io_concurrency" on systems without posix_fadvise().
Modified Files:
--------------
pgsql/src/backend/utils/misc:
guc.c (r1.498 -> r1.499)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/guc.c?r1=1.498&r2=1.499)