[sys][sql] fix mistake CInt => CString for literal "TRUE"|"FALSE"
[sys][sql][Postgres] Fixes 'LIMIT #,# syntax is not supported' on PostgreSQL

Generates "SELECT * FROM table WHERE TRUE LIMIT # OFFSET #" query
which is compatible with PostgreSQL
While still remaining compatibility with MySQL

MySQL 5.5.32 (shows works with both)
http://sqlfiddle.com/#!2/130f7/4

PostgreSQL 9.3.1 (shows only works with this patch)
http://sqlfiddle.com/#!15/6a28b/1

Link to PostgreHX : https://github.com/jdonaldson/postgrehx

Test project that will build and generate proper postgresql successfully with this update
https://gist.github.com/theRemix/e404fec94e10a8d103a6