[pgpool-committers: 8886] pgpool: Fix not to print warnings of use of backslashes in parser.

[Tatsuo Ishii]

Fix not to print warnings of use of backslashes in parser.

When standard_conforming_strings = off and escape_string_warning = on,
PostgreSQL prints warnings if backslashes are used in string
literal. This is fine. But previously Pgpool-II's parser printed the
same message too. This is redundant.

Branch
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V4_0_STABLE

Details
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https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=4a48f5bf2ffdb84104d469670281472c2264fd40

Modified Files
--------------
src/parser/scan.c | 1055 ++++++++++++++++++++++++++++++++---------------------
src/parser/scan.l |    9 +
2 files changed, 655 insertions(+), 409 deletions(-)