Force linking to clang_rt_builtins when using LLVM for AppleM4

Author: martin-frbg

Makefile.arm64

@@ -313,7 +313,8 @@ ifneq ($(C_COMPILER), GCC)
 ifeq ($(APPLECLANG),1)
 CCOMMON_OPT += -march=armv8.4-a+sme
 else
-CCOMMON_OPT += -march=armv8.4-a
+CCOMMON_OPT += -march=armv8.4-a+sme
+override LFLAGS += -lclang_rt_builtins-aarch64
 endif
 else
 CCOMMON_OPT += -march=armv8.4-a