Merge pull request #9318 from zeha/gsql-specific

gsqlbackend: allow backend-specific queries

diff --cc modules/gmysqlbackend/gmysqlbackend.cc
Simple merge

diff --cc modules/godbcbackend/godbcbackend.cc
Simple merge

diff --cc modules/gpgsqlbackend/gpgsqlbackend.cc
Simple merge

diff --cc modules/gsqlite3backend/gsqlite3backend.cc
Simple merge

diff --cc pdns/backends/gsql/gsqlbackend.hh
Simple merge