adding *.a files (works commit)

It results *.a files are contained in mysql56u-devel.

```
$ rpm -qlpi /home/build/rpmbuild/RPMS/x86_64/mysql56u-devel-5.6.14-1.el6.x86_64.rpm|grep /usr/lib64/mysql/
/usr/lib64/mysql/libmysqlclient.a
/usr/lib64/mysql/libmysqlclient.so
/usr/lib64/mysql/libmysqlclient_r.a
/usr/lib64/mysql/libmysqlclient_r.so
/usr/lib64/mysql/libmysqlservices.a
```