fix cmake typo for power10 cc version check

fixes 668f48f4fc

cmake/system.cmake

@@ -263,7 +263,7 @@ if (DEFINED TARGET)
   endif()
 
   if (${TARGET} STREQUAL POWER10)
-    if (CMAKE_C_COMPILER VERSION VERSION_GREATER 10.2 OR CMAKE_C_COMPILER_VERSION VERSION_EQUAL 10.2)
+    if (CMAKE_C_COMPILER_VERSION VERSION_GREATER 10.2 OR CMAKE_C_COMPILER_VERSION VERSION_EQUAL 10.2)
       set (KERNEL_DEFINITIONS  "${KERNEL_DEFINITIONS} -mcpu=power10 -mtune=power10 -mvsx -fno-fast-math")
     else ()
 	    message(FATAL_ERROR "Compiler GCC ${CMAKE_C_COMPILER_VERSION} does not support Power10.")