Adopt latest bison's spelling of 'syntax error' rather than 'parse error'

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 9fbd52808e92d16ae9815a1e6d515829bf7bd025
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2003-05-29T20:40:36Z
Releases: 7.4.1
Adopt latest bison's spelling of 'syntax error' rather than 'parse error'
for grammar-detected problems.  Revert Makefile hack that kept it looking
like the pre-bison-1.875 output.

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