Fix two bugs in scripts.

1. If update.sh failed to determine the PREFIX, it didn't realize it
had failed.  This is arguably caused by a shell bug in processing
the statement

    export PREFIX=$(expr $0 : "\(/.*\)/etc/cvsup/update\.sh\$")

This statement always succeeds even if the "expr" command fails.
Moving the "export" to a separate statement makes it work.

2. If the system had no "/home" directory, the pkg-install script
would create it with mode 0700, making ~cvsupin inaccessible to its
owner.  A user ran into this bug when installing cvsup-mirror into a
jail.

net/cvsup-mirror/Makefile

@@ -7,7 +7,7 @@
 
 PORTNAME=	cvsup-mirror
 PORTVERSION=	1.3
-PORTREVISION=	2
+PORTREVISION=	3
 CATEGORIES=	net
 DISTFILES=
 

net/cvsup-mirror/files/update.sh

@@ -1,10 +1,11 @@
 #! /bin/sh
 
-if ! export PREFIX=$(expr $0 : "\(/.*\)/etc/cvsup/update\.sh\$"); then
+if ! PREFIX=$(expr $0 : "\(/.*\)/etc/cvsup/update\.sh\$"); then
     echo "$0: Cannot determine the PREFIX" >&2
     exit 1
 fi
 
+export PREFIX
 export CVSUP_ARGS="$*"
 export PATH=/bin:/usr/bin:${PREFIX}/bin
 

net/cvsup-mirror/pkg-install

@@ -117,10 +117,10 @@ make_account() {
 	    if yesno \
 		"Would you like me to create ${u}'s home directory (${home})" y
 	    then
-		(umask 77 && \
-		    mkdir -p ${home}/.cvsup && \
-		    touch ${home}/.cvsup/auth) || exit
+		mkdir -p ${home}/.cvsup || exit
+		touch ${home}/.cvsup/auth || exit
 		chown -R ${u}:${g} ${home} || exit
+		chmod -R go= ${home} || exit
 	    else
 		echo "Please create it, and try again."
 		exit 1