[U-Boot] [PATCH] Makefile: remove symbolic links in tools/

[Alessandro Rubini <rubini-list@gnudd.com>]

Mike Frysinger about -delete:
> i didnt suggest that because it isnt POSIX.  it'll break on BSD systems which
> typically ship with sh*t userland tools.

Actually, I just copied the above line with "-name *" and stuff
because I know there are portability issues I'm not aware of.
Actually, Git blame says -name comes from an original "-lname *", that
Jean Christophe turned to "-name * -type l" for posix compliance.  He
has been tricked by the original name-based match.

I proposed the one-liner only because I remember a similar issue being
addressed not long ago in the makefiles.  But I'm fine with removing
all such legacy, either, assuming novices will have a clean tool and
git users are able to "git status" or "git clean".

/alessandro