[PATCH 2 of 3 osx-packaging] osx: use more paranoid quoting in test

[Augie Fackler]

# HG changeset patch
# User Augie Fackler <augie at google.com>
# Date 1490046587 14400
#      Mon Mar 20 17:49:47 2017 -0400
# Node ID 58e38cc8a32128436c27c90f431b150acd925024
# Parent  fe228efc0c3eabfdda7b9988b776412f03fbf717
osx: use more paranoid quoting in test

diff --git a/tests/test-mac-packages.t b/tests/test-mac-packages.t
--- a/tests/test-mac-packages.t
+++ b/tests/test-mac-packages.t
@@ -2,15 +2,14 @@
 
   $ . "$TESTDIR/helpers-testrepo.sh"
 
-  $ OUTPUTDIR=`pwd`
+  $ OUTPUTDIR="`pwd`"
   $ export OUTPUTDIR
   $ KEEPMPKG=yes
   $ export KEEPMPKG
 
   $ cd "$TESTDIR"/..
-  $ rm -rf dist
-  $ make osx > $OUTPUTDIR/build.log 2>&1
-  $ cd $OUTPUTDIR
+  $ make osx > "$OUTPUTDIR/build.log" 2>&1
+  $ cd "$OUTPUTDIR"
   $ ls -d *.pkg
   Mercurial-*-macosx10.*.pkg (glob)