• Remove support for automatic detection of libssl/libcrypto via pkg-config
  with ExtUtils::PkgConfig if it is installed, due to the compiler and linker
  options provided by pkg-config being used unconditionally (which is
  incompatible with the OPENSSL_PREFIX detection method). The implementation of
  this was merged in time for developer release 1.93_03 and therefore hasn't
  been included in a stable release yet, so this doesn't represent a breaking
  change to the way in which libssl/libcrypto are detected by Makefile.PL. This
  is, however, a very useful feature, and we intend to bring it back in time
  for Net-SSLeay 1.96 after ironing out the remaining bugs.