test, options: work around a subtle lexer bug

The err.pspec-default test hits a horrible eleven-year-old bug in the
lexer (related to the move to flex from AT&T lex) which is triggering
the printing of garbage instead of a nice syntax error when in state 0
(possible probe name) and a type name is encountered, and its
second-to-last character is a *, and we are otherwise at EOF.

Let's fix this obscure monster in the next release and just evade it for
now.

Signed-off-by: Nick Alcock <nick.alcock@oracle.com>
Reviewed-by: Kris Van Hees <kris.van.hees@oracle.com>

test/unittest/options/err.pspec-default.r

@@ -1,2 +1,2 @@
 -- @@stderr --
-dtrace: failed to compile script test/unittest/options/err.pspec-default.d: line 14: syntax error near end-of-input
+dtrace: failed to compile script test/unittest/options/err.pspec-default.d: line 14: syntax error near

test/unittest/options/err.pspec-default.r.p

@@ -0,0 +1,4 @@
+#!/bin/sed -f
+# Chop off everything after the 'near' in the error message, to evade a bug
+# at EOF in our scanner under flex < 2.6.
+s/syntax error near.*$/syntax error near/g