bin/sh/mksyntax.c has wrong error handling [patch]

Hey guys,

bin/sh/mksyntax.c contains call to the perror() function, while
sh has its own error function, that is used everywhere in the code,
and is define in error.c, namely error(). For code consistency mksyntax.c
should also be made to use this function, here is a patch:

http://virtus.ath.cx/dfbsd/mksyntax.c.diff

Regards,
Douwe