MDEV-33750: Conflict with Debian libmariadbd19t64

Conflict with Debian package libmariadbd19t64 as it marks
that package is compliant with 64-bit time and does not
suffer from year 2038 effect

debian/control

@@ -205,6 +205,7 @@ Section: libs
 Depends: ${misc:Depends},
          ${shlibs:Depends}
 Breaks: libmariadbd-dev (<< ${source:Version})
+Conflicts: libmariadbd19t64
 Replaces: libmariadbd-dev (<< ${source:Version})
 Multi-Arch: same
 Description: MariaDB embedded database, shared library