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Add define YASSL_PREFIX when compiling yassl

Import patch from yaSSL
- avoid allocating memory for each call to 'EVP_md5' and 
  'EVP_des_ede3_cbc' which were not released until server was stopped
- Those functions are used from the SQL function 'des_encrypt' and
  'des_decrypt'.

Add new define YASSL_PREFIX beforee including ssl.h to activate inclusion of prefix_*.h files

Bug#20022 mysql-test-run can't be run with secure connections turned on for all testcases
- Part 1, fixes rpl- and federated-tests where connection is made to 127.0.0.1

- Include prefix files that renames all public functions in yaSSLs
  OpenSSL API to ya<function_name>. They will otherwise conflict
  with OpenSSL functions if loaded by an application that uses OpenSSL
  as well as libmysqlclient with yaSSL support.

Bug#18235: assertion/crash when windows mysqld is ended with ctrl-c
  
Two threads both try a shutdown sequence which creates a race to the
de-init/free of certain r...