Fix normals for Issue 4425084: Blender COLLADA patch for optional export of selected and modified el

Based on http://codereview.appspot.com/4425084/.

Fixed the issue with normals being exported incorrectly.

Had to change BLENDER_CONFIG > BLENDER_USER_CONFIG to get the original patch compiling against r36947

[pjoe, 2011-05-28 09:11:59]

Did some more testing:
 * Subdivided Suzanne ~8K faces
 * Deformed with lattice
 * Exported and re-imported (tried FLAT and SMOOTHED)

Everything works as expected

[jesterKing, 2011-05-31 12:13:01]

Quick reply so message gets sent to bf-coderview too.

[pjoe, 2011-06-05 10:26:45]

Updated against 37203

[pjoe, 2011-06-13 08:33:38]

After doing some simple tests with skinned meshes, I've noticed an issue when
exporting with modifiers:

DerivedMesh will deform the actual mesh data according to the armature modifier.
On top of this a collada skin controller is also exported. This means that if
you are not in bind pose when exporting things will get screwed up, as the
armature deform is present both in mesh data and skin controller.