More complete ppc64 matches.

Index: x265_2.2/source/CMakeLists.txt
===================================================================
--- old/CMakeLists.txt
+++ new/CMakeLists.txt
@@ -44,7 +44,7 @@ set(X86_ALIASES x86 i386 i686 x86_64 amd
 set(ARM_ALIASES armv6l armv6j armv7l armv7a)
 list(FIND X86_ALIASES "${SYSPROC}" X86MATCH)
 list(FIND ARM_ALIASES "${SYSPROC}" ARMMATCH)
-set(POWER_ALIASES ppc64 ppc64le)
+set(POWER_ALIASES ppc64 ppc64le powerpc64 powerpc64le)
 list(FIND POWER_ALIASES "${SYSPROC}" POWERMATCH)
 if("${SYSPROC}" STREQUAL "" OR X86MATCH GREATER "-1")
     set(X86 1)