extensions: include current version in "invalid version" message
It is "not so rare" for the mercurial version to be badly detected at build
time. In such case, version check for extensions gets confused.
To help pinpoint the error, we now include the Mercurial's version number in
the error message.
#require serve
$ hg clone http://localhost:$HGPORT/ copy
abort: * (glob)
[255]
$ test -d copy
[1]
$ "$PYTHON" "$TESTDIR/dumbhttp.py" -p $HGPORT --pid dumb.pid
$ cat dumb.pid >> $DAEMON_PIDS
$ hg clone http://localhost:$HGPORT/foo copy2
abort: HTTP Error 404: * (glob)
[255]
$ killdaemons.py