well you could do one of two things, upgrade mysql completely(using RPMs) or you sylink libmysqlclient.so.15 to libmysqlclient.so.14 using this
Code:
ln -sf /path/to/libmysqlclient.so.14 /same/path/but/named/libmysqlclient.so.15
It is better to completely reinstall mysql, in my opinion, but you can usually do both.