Adjust kerberos and ldap tests for Homebrew on ARM

The Homebrew package manager changed its default installation prefix
for the new architecture, so a couple of tests need tweaks to find
binaries.

This is a partial backpatch of dc513bc654.

src/test/kerberos/t/001_auth.pl

@@ -32,8 +32,15 @@ else
 
 my ($krb5_bin_dir, $krb5_sbin_dir);
 
-if ($^O eq 'darwin')
+if ($^O eq 'darwin' && -d "/opt/homebrew" )
 {
+	# typical paths for Homebrew on ARM
+	$krb5_bin_dir  = '/opt/homebrew/opt/krb5/bin';
+	$krb5_sbin_dir = '/opt/homebrew/opt/krb5/sbin';
+}
+elsif ($^O eq 'darwin')
+{
+	# typical paths for Homebrew on Intel
 	$krb5_bin_dir  = '/usr/local/opt/krb5/bin';
 	$krb5_sbin_dir = '/usr/local/opt/krb5/sbin';
 }

src/test/ldap/t/001_auth.pl

@@ -20,9 +20,15 @@ my ($slapd, $ldap_bin_dir, $ldap_schema_dir);
 
 $ldap_bin_dir = undef;    # usually in PATH
 
-if ($^O eq 'darwin' && -d '/usr/local/opt/openldap')
+if ($^O eq 'darwin' && -d '/opt/homebrew/opt/openldap')
 {
-	# typical paths for Homebrew
+	# typical paths for Homebrew on ARM
+	$slapd           = '/opt/homebrew/opt/openldap/libexec/slapd';
+	$ldap_schema_dir = '/opt/homebrew/etc/openldap/schema';
+}
+elsif ($^O eq 'darwin' && -d '/usr/local/opt/openldap')
+{
+	# typical paths for Homebrew on Intel
 	$slapd           = '/usr/local/opt/openldap/libexec/slapd';
 	$ldap_schema_dir = '/usr/local/etc/openldap/schema';
 }