Adjust M4 options to avoid unresolved reference with non-Apple LLVM

Author: martin-frbg

kernel/Makefile

@@ -38,7 +38,7 @@ ifeq ($(TARGET_CORE), VORTEXM4)
   ifeq ($(C_COMPILER), GCC)
  override CFLAGS += -DBUILD_KERNEL -DTABLE_NAME=gotoblas_$(TARGET_CORE) -UHAVE_SME -march=armv8.4-a
   else
- override CFLAGS += -DBUILD_KERNEL -DTABLE_NAME=gotoblas_$(TARGET_CORE) -march=armv8.4-a+sme
+ override CFLAGS += -DBUILD_KERNEL -DTABLE_NAME=gotoblas_$(TARGET_CORE) -march=armv8.4-a -mcpu=apple-m4
    ifdef OS_WINDOWS
    ifeq ($(C_COMPILER), CLANG)
    override CFLAGS += --aarch64-stack-hazard-size=0