Use TCL_CC_SEARCH_FLAGS, not TCL_LD_SEARCH_FLAGS

[DJ Delorie]

> DJ,
> 
> According to ../MAINTAINERS, I send these to you?  It's checked in. 
> What next?

I have no idea.  I don't remember how I got to be the expect
maintainer; it's the oddball in that list (well, it, etc, and utils),
as it doesn't exist in the gcc repository.  I think only dejagnu uses
that expect, and I don't know what the upstream rules are.  So if it's
in and you're happy, I'm not going to worry about it.