test-amend: fix HGEDITOR shell script to run on Windows

Windows doesn't know how to launch *.sh directly.  This workaround is used in
several other tests.

tests/test-amend.t

@@ -1,220 +1,220 b''
 #testcases obsstore-off obsstore-on
 
   $ cat << EOF >> $HGRCPATH
   > [extensions]
   > amend=
   > debugdrawdag=$TESTDIR/drawdag.py
   > [diff]
   > git=1
   > EOF
 
 #if obsstore-on
   $ cat << EOF >> $HGRCPATH
   > [experimental]
   > evolution=createmarkers
   > EOF
 #endif
 
 Basic amend
 
   $ hg init repo1
   $ cd repo1
   $ hg debugdrawdag <<'EOS'
   > B
   > |
   > A
   > EOS
 
   $ hg update B -q
   $ echo 2 >> B
 
 #if obsstore-off
   $ hg amend
   saved backup bundle to $TESTTMP/repo1/.hg/strip-backup/112478962961-af2c0941-amend.hg (glob)
   $ hg log -p -G --hidden -T '{rev} {node|short} {desc}\n'
   @  1 be169c7e8dbe B
   |  diff --git a/B b/B
   |  new file mode 100644
   |  --- /dev/null
   |  +++ b/B
   |  @@ -0,0 +1,1 @@
   |  +B2
   |
   o  0 426bada5c675 A
      diff --git a/A b/A
      new file mode 100644
      --- /dev/null
      +++ b/A
      @@ -0,0 +1,1 @@
      +A
      \ No newline at end of file
   
 #else
   $ hg amend
   $ hg log -p -G --hidden -T '{rev} {node|short} {desc}\n'
   @  3 be169c7e8dbe B
   |  diff --git a/B b/B
   |  new file mode 100644
   |  --- /dev/null
   |  +++ b/B
   |  @@ -0,0 +1,1 @@
   |  +B2
   |
   | x  2 edf08988b141 temporary amend commit for 112478962961
   | |  diff --git a/B b/B
   | |  --- a/B
   | |  +++ b/B
   | |  @@ -1,1 +1,1 @@
   | |  -B
   | |  \ No newline at end of file
   | |  +B2
   | |
   | x  1 112478962961 B
   |/   diff --git a/B b/B
   |    new file mode 100644
   |    --- /dev/null
   |    +++ b/B
   |    @@ -0,0 +1,1 @@
   |    +B
   |    \ No newline at end of file
   |
   o  0 426bada5c675 A
      diff --git a/A b/A
      new file mode 100644
      --- /dev/null
      +++ b/A
      @@ -0,0 +1,1 @@
      +A
      \ No newline at end of file
   
 #endif
 
 Nothing changed
 
   $ hg amend
   nothing changed
   [1]
 
 Matcher and metadata options
 
   $ echo 3 > C
   $ echo 4 > D
   $ hg add C D
   $ hg amend -m NEWMESSAGE -I C -q
   $ hg log -r . -T '{node|short} {desc} {files}\n'
   c7ba14d9075b NEWMESSAGE B C
   $ echo 5 > E
   $ rm C
   $ hg amend -d '2000 1000' -u 'Foo <[e-mail]>' -A C D -q
   $ hg log -r . -T '{node|short} {desc} {files} {author} {date}\n'
   14f6c4bcc865 NEWMESSAGE B D Foo <[e-mail]> 2000.01000
 
 Amend with editor
 
   $ cat > $TESTTMP/prefix.sh <<'EOF'
   > printf 'EDITED: ' > $TESTTMP/msg
   > cat "$1" >> $TESTTMP/msg
   > mv $TESTTMP/msg "$1"
   > EOF
   $ chmod +x $TESTTMP/prefix.sh
 
-  $ HGEDITOR="$TESTTMP/prefix.sh" hg amend --edit -q
+  $ HGEDITOR="sh $TESTTMP/prefix.sh" hg amend --edit -q
   $ hg log -r . -T '{node|short} {desc}\n'
   298f085230c3 EDITED: NEWMESSAGE
-  $ HGEDITOR="$TESTTMP/prefix.sh" hg amend -e -m MSG -q
+  $ HGEDITOR="sh $TESTTMP/prefix.sh" hg amend -e -m MSG -q
   $ hg log -r . -T '{node|short} {desc}\n'
   974f07f28537 EDITED: MSG
 
   $ echo FOO > $TESTTMP/msg
   $ hg amend -l $TESTTMP/msg -m BAR
   abort: options --message and --logfile are mutually exclusive
   [255]
   $ hg amend -l $TESTTMP/msg -q
   $ hg log -r . -T '{node|short} {desc}\n'
   507be9bdac71 FOO
 
 Interactive mode
 
   $ touch F G
   $ hg add F G
   $ cat <<EOS | hg amend -i --config ui.interactive=1 -q
   > y
   > n
   > EOS
   diff --git a/F b/F
   new file mode 100644
   examine changes to 'F'? [Ynesfdaq?] y
   
   diff --git a/G b/G
   new file mode 100644
   examine changes to 'G'? [Ynesfdaq?] n
   
   $ hg log -r . -T '{files}\n'
   B D F
 
 Amend in the middle of a stack
 
   $ hg init $TESTTMP/repo2
   $ cd $TESTTMP/repo2
   $ hg debugdrawdag <<'EOS'
   > C
   > |
   > B
   > |
   > A
   > EOS
 
   $ hg update -q B
   $ echo 2 >> B
   $ hg amend
   abort: cannot amend changeset with children
   [255]
 
 #if obsstore-on
 
 With allowunstable, amend could work in the middle of a stack
 
   $ cat >> $HGRCPATH <<EOF
   > [experimental]
   > evolution=createmarkers, allowunstable
   > EOF
 
   $ hg amend
   $ hg log -T '{rev} {node|short} {desc}\n' -G
   @  4 be169c7e8dbe B
   |
   | o  2 26805aba1e60 C
   | |
   | x  1 112478962961 B
   |/
   o  0 426bada5c675 A
   
 #endif
 
 Cannot amend public changeset
 
   $ hg phase -r A --public
   $ hg update -C -q A
   $ hg amend -m AMEND -q
   abort: cannot amend public changesets
   [255]
 
 Amend a merge changeset
 
   $ hg init $TESTTMP/repo3
   $ cd $TESTTMP/repo3
   $ hg debugdrawdag <<'EOS'
   >   C
   >  /|
   > A B
   > EOS
   $ hg update -q C
   $ hg amend -m FOO -q
   $ rm .hg/localtags
   $ hg log -G -T '{desc}\n'
   @    FOO
   |\
   | o  B
   |
   o  A