Disable excessive FP optimization by recent versions of gcc.

Suggested solution from Tom Lane. Problem discovered, probably not
for the first time, while testing the mingw-w64 32 bit compiler.

Backpatched to all live branches.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/5878a328e36b7f59c6c173212b77d0536e8804dd

Modified Files
--------------
configure    |   61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
configure.in |    2 +
2 files changed, 63 insertions(+), 0 deletions(-)

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Next:	From: Andrew Dunstan	Date: 2011-12-14 22:16:32
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