Increase max shader bones by one.
Increase max shader bones by one.

Note that this constant should be outside the shader header.
We have a bug to pull it out.

Change-Id: I4a41e1b95fdbc181bc6c99f542d4994eef77f80f
Tested: Zooshi with extra bone in Giraffe renders fine.

google/fplbase,google/fplbase,google/fplbase,google/fplbase