fix test-strip-cross on solaris

Apparently "ENVVAR=value command" doesn't work when command is a shell
function.

Reported by Richard Lowe.

tests/test-strip-cross

@@ -1,67 +1,68 b''
 #!/bin/sh
 
 # test stripping of filelogs where the linkrev doesn't always increase
 
 echo '[extensions]' >> $HGRCPATH
 echo 'hgext.mq =' >> $HGRCPATH
 
 hg init orig
 cd orig
 
 hidefilename()
 {
     sed -e 's/saving bundle to .*strip-backup/saving bundle to strip-backup/'
 }
 
 commit()
 {
     hg up -qC null
     count=1
     for i in "$@"; do
 	for f in $i; do
 	    echo $count > $f
 	done
 	count=`expr $count + 1`
     done
     hg commit -qAm "$*"
 }
 
 # 2 1 0 2 0 1 2
 commit '201 210'
 
 commit '102 120' '210'
 
 commit '021'
 
 commit '201' '021 120'
 
 commit '012 021' '102 201' '120 210'
 
 commit 'manifest-file'
 
 commit '102 120' '012 210' '021 201'
 
 commit '201 210' '021 120' '012 102'
 
-HGUSER=another-user commit 'manifest-file'
+HGUSER=another-user; export HGUSER
+commit 'manifest-file'
 
 commit '012' 'manifest-file'
 
 cd ..
 hg clone -q -U -r -1 -r -2 -r -3 -r -4 -r -6 orig crossed
 
 for i in crossed/.hg/store/00manifest.i crossed/.hg/store/data/*.i; do
     echo $i
     hg debugindex $i
     echo
 done
 
 for i in 0 1 2 3 4; do
     hg clone -q -U --pull crossed $i
     echo "% Trying to strip revision $i"
     hg --cwd $i strip $i 2>&1 | hidefilename
     echo "% Verifying"
     hg --cwd $i verify
     echo
 done