Compilation againist PgSQL 7.4

Hello,

I take a look at compilation againist older version of PgSQL. First
step is PgSQL version 7.4.X. Here is attached patch but it needs add

#define PGSQL_VERSION <major number><minor number>

eg.

#degine PGSQL_VERSION 74

into config.h. I'm not compliant with configure. The value for PGSQL_VERSION
could be taken from pg_config --version (output: PostgreSQL 7.4.8).
How can this be doing in Windows environment? Have we more config.h-version
files?

Thist patch also remove return ret from CC_send_cancel as it is already
called from both part of if (few lines above).

Thanks

Luf