hugs98: configure Linuxism

[Volker Stolz]

Hi, there's a Linuxism in hugs98-Dec2001/src/unix/configure:

if (test "`basename ${YACC}`x" == "byaccx"); then
   echo "Found 'byacc', but the Hugs98 parser is incompatible with it."

The test should be one simple "=" for string equality. This will make
configure trip e.g. on FreeBSD (though it'll do no harm -- yet).

Regards,
  Volker
-- 
plonk :: m a -> m ()
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