[rfa/toplevel] Conditionalize GDB_TK

[Andrew Cagney]

Hello,

The attatched only adds the tk directories to the gdb dependency list 
when the corresponding tk files are present.  That way `all-gdb' doesn't 
build tk files (except when needed).

ok?
Andrew

PS: Disclaimer, I cut/paste the configure changes.  Perhaphs someone 
able to regenerate configure should commit this?
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