Force bison invocation to include -d flag so that yac.h is rebuilt.

The copy supplied in the 2.2.11 distribution does not have the same

symbol numbering that's generated by current Bison, and so the lexer

is out-of-step with the grammar if it just uses that version.  This

results in complete failure of the sqp library, leading to reported

problems with text-file driver (bz #162676).

diff -Naur unixODBC-2.2.11.orig/sqp/Makefile.am unixODBC-2.2.11/sqp/Makefile.am

--- unixODBC-2.2.11.orig/sqp/Makefile.am	2004-09-13 08:30:29.000000000 -0400

+++ unixODBC-2.2.11/sqp/Makefile.am	2005-09-29 15:19:52.000000000 -0400

@@ -1,3 +1,5 @@

+AM_YFLAGS = -d

+

 if HAVE_FLEX

 noinst_LTLIBRARIES = libsqplc.la