Update gfortran support on win64
Update gfortran support on win64

We don't link the gfortran runtime when built with MS compilers: there are some
incompatibilities between libgfortran and dependent libraries (mingwex, etc..)
and the MS C runtime. Instead, we will implement the needed function from
libgfortran and compile it with MS compiler, with the MS C runtime.

git-svn-id: 77a43f9646713b91fea7788fad5dfbf67e151ece@7087 94b884b6-d6fd-0310-90d3-974f1d3f35e1

Ademan/NumPy-GSoC,jasonmccampbell/numpy-refactor-sprint,illume/numpy3k,chadnetzer/numpy-gaurdro,jasonmccampbell/numpy-refactor-sprint,teoliphant/numpy-refactor,chadnetzer/numpy-gaurdro,chadnetzer/numpy-gaurdro,chadnetzer/numpy-gaurdro,illume/numpy3k,teoliphant/numpy-refactor,Ademan/NumPy-GSoC,jasonmccampbell/numpy-refactor-sprint,teoliphant/numpy-refactor,teoliphant/numpy-refactor,Ademan/NumPy-GSoC,illume/numpy3k,jasonmccampbell/numpy-refactor-sprint,Ademan/NumPy-GSoC,illume/numpy3k,teoliphant/numpy-refactor