Disable feature detection until we find a more portable way.

--- crypto/arch/aarch64/crypto_cpu_caps.c.orig	Sat Dec 14 13:45:16 2024
+++ crypto/arch/aarch64/crypto_cpu_caps.c	Sat Dec 14 13:54:06 2024
@@ -16,9 +16,12 @@
  */
 
 #include <sys/types.h>
+
+#if defined(__OpenBSD__)
 #include <sys/sysctl.h>
 
 #include <machine/cpu.h>
+#endif
 
 #include <stddef.h>
 #include <stdio.h>
@@ -67,6 +70,7 @@ parse_isar0(uint64_t isar0)
 	return caps;
 }
 
+#if defined(__OpenBSD__)
 static int
 read_isar0(uint64_t *isar0)
 {
@@ -84,6 +88,13 @@ read_isar0(uint64_t *isar0)
 
 	return 1;
 }
+#else
+static int
+read_isar0(uint64_t *isar0)
+{
+	return 0;
+}
+#endif
 
 void
 crypto_cpu_caps_init(void)