Conditionally link with libmysqlclient.la or libmysqlclient_r.la
configure.in:
  Corrected help text for --with-debug option
  Changed default to be with thread safe client
  Added THREAD_SAFE_CLIENT to be used in 'if' in make files


configure.in:
  Corrected help text for --with-debug option
  Changed default to be with thread safe client
  Added THREAD_SAFE_CLIENT to be used in 'if' in make files
client/Makefile.am:
  Conditionally link with libmysqlclient.la or libmysqlclient_r.la