The latest change (adding DEPENDS) made expect build and install

tcl/tk even if they are properly found by LIB_DEPENDS.  Make it
only extract in that case.

While I'm here, make expect and expectk link with shared tcl/tk libs.
expectk used to be a 1/2 MB binary!  (now it's 136KB)

I'd also rather change `-g' to whatever CFLAGS defined in
/etc/make.conf, but the author of expect has an explicit comment in
the Makefile about him not trusting compilers' optimization.  Well,
if you say so.

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