Log Message:
Update ruby-mysql package to 2.7.6.

2008-06-17
    version 2.7.6
     * On 64bit machine, Mysql::Stmt#execute raise error on large numeric
        value(>= 2**30).
2008-03-08
    version 2.7.5
     * On 64bit machine, Mysql::Stmt#fetch return invalid numeric value.
2007-12-26
    version 2.8pre1
     * for Ruby 1.9.0
     * Incompat: Mysql::Result#each_hash don't create column name string each
        row. it's shared.
     * Incompat: Mysql#query with block no longer turn on multi-statements
        mode automatically.
2007-08-22
    version 2.7.4
     * BUG: Mysql::Stmt#execute memory leak.