This reverts commit 39994150ba.

No modification was being done to buf after the copy of filepath.
It was just being passed to fopen. As such the copy is redundant,
and can lead to buffer overflow issues if the specified filepath
is larger than buf.

This reverts commit 9689cc8860.

https://github.com/espeak-ng/espeak-ng/issues/407

If ph_code is not located in the phoneme_tab, the resulting ph
value will be NULL. This does not normally happen, but it can
happen if word_phonemes contains garbage data, such as with the
1.49.2 multi-word logic when processing words like 'riposted'.

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.

The phoneme to audio tests are covered in the phoneme-audio tests.
Therefore, the language tests just need to test the text to
phoneme logic.