Escaping $tclsh in Makefile.PL

[Christopher Chavez]

In the Makefile.PL's for Tcl.pm, Tcl::Tk, and Tcl::pTk, the path to 
tclsh should probably be escaped somehow. That way, any characters like 
spaces get passed properly to the shell. I don't know what the best 
portable way to do this would be, nor whether surrounding it with double 
quotes (i.e. `"$tclsh" ...`) is sufficient.

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