mingw: case failure: change writeFormat to binary

Hi @mark @Prashant In windows, using mingw compiled binaries, there are some testcase which shows failure with following messages. By changing writing format to binary or increasing writePrecesion resolve the issue.

--> FOAM FATAL ERROR: Your current settings specify ASCII writing with 6 digits precision.
Your merging tolerance (1e-06) is finer than this.
Change to binary writeFormat, or increase the writePrecision
or adjust the merge tolerance (mergeTol).

My request is to change writeFormat to binary for following testcase which shows failure

. It will ensure smooth testing for following testcases.

combustion/fireFoam/LES/compartmentFire
compressible/rhoPimpleFoam/RAS/annularThermalMixer
buoyantBoussinesqSimpleFoam/iglooWithFridges
buoyantSimpleFoam/simpleCarSolarPanel
incompressible/pimpleFoam/RAS/wingMotion/wingMotion_snappyHexMesh
mesh/snappyHexMesh/flange
mesh/snappyHexMesh/addLayersToFaceZone
mesh/snappyHexMesh/iglooWithFridgesDirectionalRefinement
multiphase/interFoam/laminar/sloshingCylinder
multiphase/interPhaseChangeFoam/cavitatingBullet