Revision 1775242

Fix another build problem with LibreSSL.

* SConstruct: Check for OpenSSL_malloc_init() and provide the
   SERF_HAVE_OPENSSL_MALLOC_INIT feature flag.

* buckets/ssl_buckets.c
  (init_ssl_libraries): Use SERF_HAVE_OPENSSL_MALLOC_INIT instead
   of USE_LEGACY_OPENSSL.