bmesh recalculate normals - remove BLI_array reallocation, the max size of the array is known.
replace with STACK_* macros (moved to BLI_utildefines.h).


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56704 954f8c5b-7b00-dc11-b283-0030488c597c