Ruby/DB2 updated
Resynched to match PHP’s pecl/ibm_db2 version 1.2.0, and to support Syck version 0.60.
Most of the changes in 1.2.0 seem to have been aimed at reducing the number of compiler warnings produced. Many (most?) were already present in the Ruby version which produces zero warnings with gcc version 4.0.2. One notable omission: I can’t seem to find strlcpy on a default Ubuntu install, so this change was not applied.