Set full-path of cvsup.
Set full-path of cvsup.

In src/Makefile rev 1.232, environment variable PATH is set explicitly
to /sbin:/bin:/usr/sbin:/usr/bin.  As a result, binaries located on
non-standard path cannot be executed without full-path (it's the change
of this revision).

However, cvsup is not in our base system -- you lose if you try to
"make update" without setting SUP in make.conf or command line argument.
I think it is safe to assume that cvsup is located at /usr/local/bin,
and it would help other people who first try to do "make update".

PR:		31932
MFC after:	1 day

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