sysutils/debootstrap: make it work on arm64 without --arch

Reviewed By:	emaste
Sponsored By:	EPSRC
Differential Revision:	https://reviews.freebsd.org/D30127

sysutils/debootstrap/Makefile

@@ -2,7 +2,7 @@
 
 PORTNAME=	debootstrap
 PORTVERSION=	1.0.123
-PORTREVISION=	5
+PORTREVISION=	6
 CATEGORIES=	sysutils
 MASTER_SITES=	DEBIAN
 DISTNAME=	${PORTNAME}_${PORTVERSION}

sysutils/debootstrap/files/patch-debootstrap

@@ -30,7 +30,7 @@
  	HOST_ARCH=$(cat "$DEBOOTSTRAP_DIR/arch")
  fi
  HOST_OS="$HOST_ARCH"
-@@ -542,6 +536,11 @@ if [ -z "$HOST_OS" ]; then
+@@ -542,6 +536,14 @@ if [ -z "$HOST_OS" ]; then
  			HOST_OS=freebsd
  		;;
  	esac
@@ -38,6 +38,9 @@
 +
 +if [ "$HOST_OS" = "freebsd" -a -z "$HOST_ARCH" ]; then
 +	HOST_ARCH=`/sbin/sysctl -n hw.machine_arch`
++	if [ "$HOST_ARCH" = "aarch64" ]; then
++		HOST_ARCH=arm64
++	fi
 +	EXTRACTOR_OVERRIDE=ar
  fi