remove spurious brace

cmake/system.cmake

@@ -224,7 +224,7 @@ if (DEFINED TARGET)
   
   if ((${TARGET} STREQUAL HASWELL OR (${TARGET} STREQUAL ZEN AND NOT HAVE_AVX512VL)) AND NOT NO_AVX2)
     if (${CMAKE_C_COMPILER_ID} STREQUAL "GNU")
-	    if (CMAKE_C_COMPILER_VERSION} VERSION_GREATER 4.7 OR CMAKE_C_COMPILER_VERSION VERSION_EQUAL 4.7)
+	    if (CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.7 OR CMAKE_C_COMPILER_VERSION VERSION_EQUAL 4.7)
         set (KERNEL_DEFINITIONS "${KERNEL_DEFINITIONS} -mavx2")
       endif()
     elseif (${CMAKE_C_COMPILER_ID} STREQUAL "CLANG")