tests: prepare get-with-headers.py for MSYS get-with-headers.py took the http GET parameter as a command line parameter that had to start with '/'. MSYS on windows will mangle such paths. Instead of applying a workaround everywhere (such as an extra '/') we let get-with-headers.py add the mandatory '/'. That is consistent with the url path handling in the Mercurial url class. A few tests sent 'GET ?cmd=...' which is invalid. They will now send 'GET /?cmd=...'. This will not enable any tests for being run on windows - only remove one reason they were disabled.

--- a/tests/test-interhg.t	Wed Jun 20 23:41:21 2012 +0200
+++ b/tests/test-interhg.t	Thu Jun 21 03:05:02 2012 +0200
@@ -23,7 +23,7 @@
 
 log
 
-  $ "$TESTDIR/get-with-headers.py" localhost:$HGPORT '/' | grep bts
+  $ "$TESTDIR/get-with-headers.py" localhost:$HGPORT '' | grep bts
     <td class="description"><a href="/rev/1b0e7ece6bd6"><a href="http://bts.example.org/issue123">Issue123</a>: fixed the <i class="x">bug</i>!</a><span class="branchhead">default</span> <span class="tag">tip</span> </td>
 
 errors