res_config_odbc: Prevent Realtime fallback on record-not-found (SQL_NO_DATA)

res_config_odbc: Prevent Realtime fallback on record-not-found (SQL_NO_DATA)

This patch fixes an issue in the ODBC Realtime engine where Asterisk incorrectly
falls back to the next configured backend when the current one returns
SQL_NO_DATA (i.e., no record found).
This is a logical error and performance risk in multi-backend configurations.

Solution:
Introduced CONFIG_RT_NOT_FOUND ((void *)-1) as a special return marker.
ODBC Realtime backend now return CONFIG_RT_NOT_FOUND when no data is found.
Core engine stops iterating on this marker, avoiding unnecessary fallback.

Notes:
Other Realtime backends (PostgreSQL, LDAP, etc.) can be updated similarly.
This patch only covers ODBC.

Fixes: #1305
(cherry picked from commit dfe25fbc8a11c99980bdaf8d9a3960643fad7768)