pgsql: Generate "fake configure output" for pg_config, so that external

Log Message:
-----------
Generate "fake configure output" for pg_config, so that external builds
like Slony can figure out which options were enabled in the build.

Modified Files:
--------------
pgsql/src/tools/msvc:
Solution.pm (r1.22 -> r1.23)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/Solution.pm.diff?r1=1.22&r2=1.23)