BUG#10675 - MySQL fails to build with --openssl on Mac OS X 10.4
BUG#11150 - HP-UX yaSSL/OpenSSL configure/header problem
Remove obsolete code.


include/my_global.h:
  Obsolete code removed. OpenSSL doesn't have crypt anymore (it was dropped in ~2003).
  This patch fixes compilation failures with both OpenSSL and yaSSL on systems where
  crypt was defined in unistd.h.
  Conclusion is we do not use OpenSSL's crypt unless it wasn't defined in
  unistd.h/crypt.h and it was defined in old OpenSSL.