pycompat: remove urlunquote alias
It is duplicated by urlreq.unquote and is unused. Kill it.
We retain the imports because it is re-exported via util.urlparse,
which is used elsewhere.
Since we no longer access attributes of urlparse at module load time,
this change /should/ result in that module reverting to a lazy module.
#require execbit
$ hg init repo
$ cd repo
$ echo foo > foo
$ chmod 644 foo
$ hg ci -qAm '644'
$ chmod 755 foo
$ hg ci -qAm '755'
reverting to rev 0
$ hg revert -a -r 0
reverting foo
$ hg st
M foo
$ hg diff --git
diff --git a/foo b/foo
old mode 100755
new mode 100644
$ cd ..