pgsql: Avoid having backend-only code compiled into ecpg.

Log Message:
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Avoid having backend-only code compiled into ecpg. Per Zdenek Kotala

Modified Files:
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pgsql/src/interfaces/ecpg/preproc:
Makefile (r1.128 -> r1.129)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/Makefile?r1=1.128&r2=1.129)

Added Files:
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pgsql/src/interfaces/ecpg/preproc:
parser.c (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/parser.c?rev=1.1&content-type=text/x-cvsweb-markup)

Removed Files:
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pgsql/src/interfaces/ecpg/preproc/parser:
README
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/parser/README)
parse.h
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/parser/parse.h)