Tell Subversion that unaligned access is o.k. in PowerPC machines as well.
This will speed up text processing on them significantly.

* subversion/include/svn_types.h
  (SVN_UNALIGNED_ACCESS_IS_OK): set to 1 on PPC

Patch by: Mattias Engdegård

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1483575 13f79535-47bb-0310-9956-ffa450edef68