modify system.cmake to enable fma flag

Author: Qiyu8

cmake/system.cmake

@@ -174,7 +174,7 @@ if (DEFINED TARGET)
   endif()
   if (DEFINED HAVE_AVX)
 	if (NOT NO_AVX)
-    set (KERNEL_DEFINITIONS "${KERNEL_DEFINITIONS} -mavx")
+    set (KERNEL_DEFINITIONS "${KERNEL_DEFINITIONS} -mavx -mfma")
 	endif()
   endif()
   if (DEFINED HAVE_AVX2)

kernel/Makefile

@@ -5,10 +5,6 @@ endif
 TOPDIR	= ..
 include $(TOPDIR)/Makefile.system
 
-ifdef HAVE_FMA3
-CFLAGS += -mfma
-endif
-
 ifeq ($(ARCH), power)
 ifeq ($(C_COMPILER), CLANG)
  override CFLAGS += -fno-integrated-as