PatR 32890d1bc1 fix 'makedefs -z' for config using FILE_PREFIX ...

Apply user-contributed patch to make do_vision() handle FILE_PREFIX
correctly.  It was putting that value into the filename buffer, then
overwriting it with the ordinary filename instead of appending.

Deletion of just-made vis_tab.h when creation of vis_tab.c fails would
have failed too if FILE_PREFIX had been working.

The patch was against 3.4.3 and didn't apply cleanly to current code,
but it is a staightforward fix, although the file deletion case was
buggy (failed to clear "vis_tab.c" from buffer before reconstructing
"vis_tab.h" via appending stuff).  FILE_PREFIX seems to be Amiga-only
so I've only tested the usual case where it isn't defined.

2018-01-23 00:52:57 -08:00

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