Bourne shells do not maintain $PWD; update tests accordingly

tests/test-convert-p4

@@ -6,7 +6,7 b' echo "[extensions]" >> $HGRCPATH'
 echo "convert = " >> $HGRCPATH
 
 echo % create p4 depot
-P4ROOT=$PWD/depot; export P4ROOT
+P4ROOT=`pwd`/depot; export P4ROOT
 P4AUDIT=$P4ROOT/audit; export P4AUDIT
 P4JOURNAL=$P4ROOT/journal; export P4JOURNAL
 P4LOG=$P4ROOT/log; export P4LOG

tests/test-template-engine

@@ -20,7 +20,7 b' EOF'
 
 hg init test
 echo '[extensions]' > test/.hg/hgrc
-echo "engine = $PWD/engine.py" >> test/.hg/hgrc
+echo "engine = `pwd`/engine.py" >> test/.hg/hgrc
 
 cd test
 cat > mymap << EOF