hghave: be more tolerant to rst2html output
On Windows, rst2html.bat calls rst2html.py, printing something like:
"rst2html.py (Docutils"
(notice the extra ".py")
-- With aaa
Status:
A somename
other-file
Diff:
diff --git a/other-file b/somename
copy from other-file
copy to somename
-- With zzz
Status:
A somename
other-file
Diff:
diff --git a/other-file b/somename
copy from other-file
copy to somename