Require gcc 11 for builtin_cpu_is(power10)

fixes #3074

Author: martin-frbg

driver/others/dynamic_power.c

@@ -202,7 +202,7 @@ static gotoblas_t *get_coretype(void) {
 		return &gotoblas_POWER10;
 #endif
 	/* Fall back to the POWER9 implementation if the toolchain is too old or the MMA feature is not set */
-#if (!defined __GNUC__) || ( __GNUC__ >= 6)
+#if (!defined __GNUC__) || ( __GNUC__ >= 11)
 	if (__builtin_cpu_is("power10"))
 		return &gotoblas_POWER9;
 #endif