code cleanup: bmesh/uv
- uv_mouse_select() move from BLI_array to alloca
- was unnecessarily looping over faces for an index lookup when an array is already created.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56920 954f8c5b-7b00-dc11-b283-0030488c597c