tools build: Fix fixdep dependencies

tools build: Fix fixdep dependencies

The tools version of fixdep has broken dependencies.  It doesn't get
rebuilt if the host compiler or headers change.

Build fixdep with the tools kbuild infrastructure, so fixdep runs on
itself.  Due to the recursive dependency, its dependency file is
incomplete the very first time it gets built.  In that case build it a
second time to achieve fixdep inception.

Reported-by: Arthur Marsh <arthur.marsh@internode.on.net>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>