Corrected some packaging bugs:
- install mysqlservices library
- install libmysqlclient_r.so.{16,16.0.0} as links
  to libmysqlclient.so
- install libmysqld-debug.a
- install my_safe_process, my_safe_kill and
  symlinks to mysql-test-run.pl (mtr, mysql-test-run)
  into correct place ${INSTALL_MYSQLTESTDIR}


cmake/install_layout.cmake:
  Fix typo
cmake/install_macros.cmake:
  Refactor INSTALL_SYMLINK to allow arbitrary symlink paths.
  Old version of this macro would make link extension the same 
  as in target. This was not sufficient in some scenarios 
  (would not allow for example libmysqlclient_r.so.16=>./libmysqlclient.so 
  link)
libmysql/CMakeLists.txt:
  Install extra symlinks to libmysqlclient.so
  (libmysqlclient_r.so.16 and libmysqlclient_r.so.16.0.0)
  for backward compatiblity.
libmysqld/CMakeLists.txt:
  install libmysqld-debug.a
libservices/CMakeLists.txt:
  install mysqlservices library
mysql-test/lib/My/SafeProcess/CMakeLists.txt:
  install my_safe_process, my_safe_kill into  correct place