Merge branch 'refs/heads/t/openssl-header-check'

* refs/heads/t/openssl-header-check:
  build: Check also for CRYPTO_cleanup_all_ex_data.
  build: Detect openssl library/header mismatch.

Two simple fixes for FreeBSD. Tested on 12.0-RELEASE-p10.

Cooking for nine months.

diff --cc NEWS.md
index bbe200102627b929907a78ff5a14792cdc45f720,55ef3be947ee76d6b0937b33988b0cd960c0e985..eda654a6a155e2f4c484bfa3013d7edc7d278aec
--- 1/NEWS.md
--- 2/NEWS.md
+++ b/NEWS.md
@@@ -1,24 -1,6 +1,26 @@@
  NEWS
  ====
  
 +----------------------------------------------
 +0.6.3 (to be announced) "generalized activity"
 +----------------------------------------------
 +
 +- The ff command now accepts a negative argument to instruct the
 +  virtual streaming system to jump backwards in the current audio
 +  stream. The old syntax (e.g., "ff 30-") is still supported but it
 +  is deprecated and no longer documented. The compatibility code is
 +  sheduled for removal after 0.7.0.
 +- para_afh: New option: --preserve to reset the modification time to
 +  the value of the original file after meta data modification.
 +- Overhaul of the compress filter code. The refined algorithm should
 +  reduce clipping. The meaning of --aggressiveness has changed, see the
 +  updated and extended documentation of the compress filter for details.
 +- Cleanup of the audio format handler code.
 +- We now build the tree using the .ONESHELL feature of GNU make,
 +  which results in a significant speedup.
++- Two robustness fixes for FreeBSD.
++
 +
  --------------------------------------
  0.6.2 (2018-06-30) "elastic diversity"
  --------------------------------------