Fixed missing alloca for Mingw gcc 4.8.1
Fixed missing alloca for Mingw gcc 4.8.1

tpaviot/oce,BenoitPerrot/oce,tpaviot/oce,tpaviot/oce,tpaviot/oce,tpaviot/oce,BenoitPerrot/oce,BenoitPerrot/oce,BenoitPerrot/oce,BenoitPerrot/oce