configurations added to build the libraries with USE_TLS flag to be
used for libmysqld


VC++Files/dbug/dbug.dsp:
  TLS_DEBUG configuration added
VC++Files/heap/heap.dsp:
  TLS and TLS_DEBUG configurations added
VC++Files/isam/isam.dsp:
  TLS and TLS_DEBUG configurations added
VC++Files/libmysql/libmysql.dsp:
  MYSQL_CLIENT define enabled
VC++Files/libmysqld/libmysqld.dsp:
  using of _tls libraries added
VC++Files/myisam/myisam.dsp:
  TLS and TLS_DEBUG configurations added
VC++Files/myisammrg/myisammrg.dsp:
  TLS and TLS_DEBUG configurations added
VC++Files/mysys/mysys.dsp:
  TLS and TLS_DEBUG configurations added
include/mysql_com.h:
  __declspec(dllimport) seems to be necessary when one uses .dll
  on Windows