gdb: remove unpush_target free function

unpush_target unpushes the passed-in target from the current inferior's
target stack.  Calling it is therefore an implicit dependency on the
current global inferior.  Remove that function and make the callers use
the inferior::unpush_target method directly.  This sometimes allows
using the inferior from the context rather than the global current
inferior.

target_unpusher::operator() now needs to be implemented in target.c,
otherwise target.h and inferior.h both need to include each other, and
that wouldn't work.

gdb/ChangeLog:

	* target.h (unpush_target): Remove, update all callers
	to use `inferior::unpush_target` instead.
	(struct target_unpusher) <operator()>: Just declare.
	* target.c (unpush_target): Remove.
	(target_unpusher::operator()): New.

Change-Id: Ia5172dfb3f373e0a75b991885b50322ca2142a8c

gdb/bsd-uthread.c

@@ -259,7 +259,7 @@ bsd_uthread_deactivate (void)
   if (!bsd_uthread_active)
     return;
 
-  unpush_target (&bsd_uthread_ops);
+  current_inferior ()->unpush_target (&bsd_uthread_ops);
 }
 
 static void