Increase datasize limit for ports building on arm64 in preparation

for enabling devel/jdk/11 there.
okay phessler@

src/etc/etc.arm64/login.conf

@@ -1,4 +1,4 @@
-# $OpenBSD: login.conf,v 1.4 2019/06/02 06:46:17 jmc Exp $
+# $OpenBSD: login.conf,v 1.5 2019/09/21 22:14:34 kurt Exp $
 
 #
 # Sample login.conf file.  See login.conf(5) for details.
@@ -92,7 +92,7 @@ authpf:\
 #
 pbuild:\
 	:datasize-max=infinity:\
-	:datasize-cur=1024M:\
+	:datasize-cur=1536M:\
 	:maxproc-max=1024:\
 	:maxproc-cur=256:\
 	:tc=default: