It only has Altivec functions and is not compiled if Altivec is disabled. (cherry picked from commit d21be5f15bec15933cb6360aa0159961d987f449)
This will be beneficial for use with the audio conversion API without requiring it to depend on all of dsputil. Signed-off-by: Mans Rullgard <mans@mansr.com> (cherry picked from commit c73d99e672329c8f2df290736ffc474c360ac4ae)