Thread: pgsql: Fix count_usable_fds() to stop trying to open files once it

Log Message:
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Fix count_usable_fds() to stop trying to open files once it reaches
max_files_per_process.  Going further than that is just a waste of
cycles, and it seems that current Cygwin does not cope gracefully
with deliberately running the system out of FDs.  Per Andrew Dunstan.

Modified Files:
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    pgsql/src/backend/storage/file:
        fd.c (r1.118 -> r1.119)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/file/fd.c.diff?r1=1.118&r2=1.119)