windows: use shell function instead of variable substitution

This makes it compatible with Windows

Differential Revision: https://phab.mercurial-scm.org/D11002

tests/test-profile.t

@@ -23,27 +23,29 b' In alias'
 
 #if lsprof
 
-  $ prof='hg --config profiling.type=ls --profile'
+  $ prof () {
+  >   hg --config profiling.type=ls --profile $@
+  > }
 
-  $ $prof st 2>../out
+  $ prof st 2>../out
   $ grep CallCount ../out > /dev/null || cat ../out
 
-  $ $prof --config profiling.output=../out st
+  $ prof --config profiling.output=../out st
   $ grep CallCount ../out > /dev/null || cat ../out
 
-  $ $prof --config profiling.output=blackbox --config extensions.blackbox= st
+  $ prof --config profiling.output=blackbox --config extensions.blackbox= st
   $ grep CallCount .hg/blackbox.log > /dev/null || cat .hg/blackbox.log
 
-  $ $prof --config profiling.format=text st 2>../out
+  $ prof --config profiling.format=text st 2>../out
   $ grep CallCount ../out > /dev/null || cat ../out
 
   $ echo "[profiling]" >> $HGRCPATH
   $ echo "format=kcachegrind" >> $HGRCPATH
 
-  $ $prof st 2>../out
+  $ prof st 2>../out
   $ grep 'events: Ticks' ../out > /dev/null || cat ../out
 
-  $ $prof --config profiling.output=../out st
+  $ prof --config profiling.output=../out st
   $ grep 'events: Ticks' ../out > /dev/null || cat ../out
 
 #endif
@@ -52,7 +54,7 b' In alias'
 
 Profiling of HTTP requests works
 
-  $ $prof --config profiling.format=text --config profiling.output=../profile.log serve -d -p $HGPORT --pid-file ../hg.pid -A ../access.log
+  $ prof --config profiling.format=text --config profiling.output=../profile.log serve -d -p $HGPORT --pid-file ../hg.pid -A ../access.log
   $ cat ../hg.pid >> $DAEMON_PIDS
   $ hg -q clone -U http://localhost:$HGPORT ../clone