Apple Clang absolutely needs the +sme in the arch string

Author: martin-frbg

Makefile.arm64

@@ -310,7 +310,11 @@ endif
 
 ifeq ($(CORE), VORTEXM4)
 ifneq ($(C_COMPILER), GCC)
+ifeq ($(APPLECLANG),1)
+CCOMMON_OPT += -march=armv8.4-a+sme -mcpu=apple-m4
+else
 CCOMMON_OPT += -march=armv8.4-a -mcpu=apple-m4
+endif
 else
 CCOMMON_OPT += -march=armv8.4-a
 endif