Optimize memory allocation in Windows xlate code.
Optimize memory allocation in Windows xlate code.

* subversion/libsvn_subr/win32_xlate.c
  (svn_subr__win32_xlate_to_stringbuf): Allocate temporary buffer for strings
   smaller than MAX_PATH on stack.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@866431 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion