Record an inter-library dependency on libcurses in libedit and libreadline,

avoiding runtime failures on architectures using ld.lld. Also add a note to
libcurses shlib_version reminding about bumps (as done with libcrypto/libssl).

Thanks guenther@ for suggestions of tests involving library bumps and jca@
for doing these tests and hint about DPADD.

Looks good kettenis@, ok jca@

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