tests: move a multi-statement debuglocks hook into a shell script for Windows

Before this patch, a part of "test-push-hook-lock.t" fails unexpectedly on
Windows environment, because semicolon (";") isn't recognized as the command
separator by "cmd.exe".  This is fixed the same way as a similar issue in
7c253c23de3b.

tests/test-push-hook-lock.t

@@ -15,8 +15,12 b''
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
+  $ cat <<EOF > $TESTTMP/debuglocks-pretxn-hook.sh
+  > hg debuglocks
+  > true
+  > EOF
   $ echo '[hooks]' >> 2/.hg/hgrc
-  $ echo 'pretxnchangegroup.a = hg debuglocks; true' >> 2/.hg/hgrc
+  $ echo "pretxnchangegroup.a = sh $TESTTMP/debuglocks-pretxn-hook.sh" >> 2/.hg/hgrc
   $ echo 'changegroup.push = hg push -qf ../1' >> 2/.hg/hgrc
 
   $ echo bar >> 3/foo