lot of fixes in plpgsql_check

if you use it, please update

Adam Bartoszewicz sent instructions and compiled ddl for plpgsql_check for windows

Adam wrote (this is a how to build a PostgreSQL extension on MS Windows):

My general steps to compile plpgsql_check plugin on Windows 7:

1. Download and install PostgreSQL 9.3.4 for Win32 from http://www.enterprisedb.com
2. Download and install Microsoft Visual C++ 2010 Express
3. Lern tutorial http://blog.2ndquadrant.com/compiling-postgresql-extensions-visual-studio-windows
4. The plpgsql_check depends on plpgsql and we need to add plpgsql.lib to the library list. Unfortunately PostgreSQL 9.4.3 does not contain this library.
5. Create a plpgsql.lib from plpgsql.dll as described in http://adrianhenke.wordpress.com/2008/12/05/create-lib-file-from-dll
6. Change plpgsql_check.c file, add PGDLLEXPORT line before evry extension function, as described in http://blog.2ndquadrant.com/compiling-postgresql-extensions-visual-studio-windows
   

   ...PGDLLEXPORT
   Datum plpgsql_check_function_tb(PG_FUNCTION_ARGS);
   PGDLLEXPORT
   Datum plpgsql_check_function(PG_FUNCTION_ARGS);
   ...
   PGDLLEXPORT
   Datum
   plpgsql_check_function(PG_FUNCTION_ARGS)
   {
   Oid            funcoid = PG_GETARG_OID(0);
   ...
   PGDLLEXPORT
   Datum
   plpgsql_check_function_tb(PG_FUNCTION_ARGS)
   {
   Oid            funcoid = PG_GETARG_OID(0);
   ...
   

7. Build plpgsql_check.dll
8. Install plugin
   
   1. copy plpgsql_check.dll to PostgreSQL\9.3\lib
   2. copy plpgsql_check.control and plpgsql_check--0.8.sql to PostgreSQL\9.3\share\extension