Merge branch 'je/pager-do-not-recurse'

We used to unconditionally disable the pager in the pager process
we spawn to feed out output, but that prevented people who want to
run "less" within "less" from doing so.

* je/pager-do-not-recurse:
  pager: do allow spawning pager recursively

pager.c

@@ -64,7 +64,7 @@ void setup_pager(void)
 {
 	const char *pager = git_pager(isatty(1));
 
-	if (!pager || pager_in_use())
+	if (!pager)
 		return;
 
 	/*