If the list file contains a text replacement to another
entry in the list file, e.g.:

	ripost     riposte $text
	riposte    rI#p0st

calling it from a prefix or suffix rule such as 'riposted'
causes word_out[0] to be NULL, as TranslateWord3 has the
information needed to perform the mapping. In this case,
no phonemes have been written in this loop and the phonemes
have been calculated, so don't override them.

This reverts commit 119c200e00.

This replaces uses of:

	memcpy(dst, src, strlen(src))

with:

	strcpy(dst, src)

This fixes issues with reading past the end of the copied buffer
(e.g. when processing word-based replacements for emoji characters)
by ensuring that the destination buffer is null terminated.

Reported by Michael Curran <[email protected]>