Only add dedicated VORTEXM4 if building with LLVM

Author: martin-frbg

driver/others/dynamic_arm64.c

@@ -169,8 +169,12 @@ extern gotoblas_t  gotoblas_A64FX;
 #endif
 #ifndef NO_SME
 extern gotoblas_t  gotoblas_ARMV9SME;
+#if defined (__clang__)
 extern gotoblas_t  gotoblas_VORTEXM4;
 #else
+#define gotoblas_VORTEXM4 gotoblas_NEOVERSEN1
+#endif
+#else
 #ifndef NO_SVE
 #define gotoblas_ARMV9SME gotoblas_ARMV8SVE
 #else