ggml : define missing HWCAP flags (#9684)

ggml-ci

Co-authored-by: Willy Tarreau <w@1wt.eu>

ggml/src/ggml.c

@@ -3687,6 +3687,10 @@ static inline int ggml_up(int n, int m) {
 #include <sys/sysctl.h>
 #endif
 
+#if !defined(HWCAP2_I8MM)
+#define HWCAP2_I8MM 0
+#endif
+
 static void ggml_init_arm_arch_features(void) {
 #if defined(__linux__) && defined(__aarch64__)
     uint32_t hwcap = getauxval(AT_HWCAP);