Build no longer requires bison/flex

Building PostgreSQL under MinGW no longer requires bison/flex.

Marc has also added a nightly tarball ready for downloading.

I also have a Win32 psql binary available on the main web page:

    http://momjian.postgresql.org/main/writings/pgsql/win32.html

--
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
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  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073