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
------
REL8_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/01e80a0c2862290bf417f699c414578c91702ef0

Modified Files
--------------
configure    |   50 ++++++++++++++++++++++++++++++++++++++++++++++++++
configure.in |    2 ++
2 files changed, 52 insertions(+), 0 deletions(-)

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