[perl #38123] [TODO] build - change genfile() interpolation syntax

[Joshua Hoblitt via RT]

The ${foo} interoplation/substitution syntax is no more.  It has been
replaced with the autoconf like @foo@ syntax and all of the *.in files
have been updated.  The special quoting syntax has also been removed
from parrot.pc.in

Support implimented in r11082 & r11117.

Cheers,

-J

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