Fix build on FreeBSD/powerpc64le

FreeBSD uses powerpc64le name for 64-bit POWER on little endian.

Author: pkubaj

CMakeLists.txt

@@ -7,7 +7,7 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 set(ENABLE_IBM OFF)
 
-if(CMAKE_SYSTEM_PROCESSOR STREQUAL "ppc64le")
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "(powerpc64le|ppc64le)")
   set(ENABLE_IBM ON)
 endif()