fix typo

Makefile.prebuild

@@ -80,7 +80,7 @@ getarch : getarch.c cpuid.S dummy $(CPUIDEMU)
 	avx512=$$(./c_check$(SCRIPTSUFFIX) - - "$(CC)" $(TARGET_FLAGS) $(CFLAGS) | grep NO_AVX512); \
 	rv64gv=$$(./c_check$(SCRIPTSUFFIX) - - "$(CC)" $(TARGET_FLAGS) $(CFLAGS) | grep NO_RV64GV); \
 	$(HOSTCC) $(HOST_CFLAGS) $(EXFLAGS) $${avx512:+-D$${avx512}} $${rv64gv:+-D$${rv64gv}} -o $(@F) getarch.c cpuid.S $(CPUIDEMU)
-	(./c_check$(SCRIPTSUFFIX) - - "$(CC)" $(TARGET_FLAGS) $(CFLAGS) | grep NO_AVX512) && echo "Disabling AVX512 support."
+	./c_check$(SCRIPTSUFFIX) - - "$(CC)" $(TARGET_FLAGS) $(CFLAGS) | grep NO_AVX512) && echo "Disabling AVX512 support."
 	
 getarch_2nd : getarch_2nd.c $(TARGET_CONF) dummy
 ifndef TARGET_CORE