Make the libcrypto detection fail the newer API. #433

1. 
   gmaxwell commented at 7:58 am on December 12, 2016: contributor

   OpenSSL 1.1 makes ECDSA_SIG opaque and our tests need access inside this object.

   The comparison tests against OpenSSL aren’t important for most users, but the build failing is…

2. Make the libcrypto detection fail the newer API.

   OpenSSL 1.1 makes ECDSA_SIG opaque and our tests need access
   inside this object.
   
   The comparison tests against OpenSSL aren't important for most
   users, but the build failing is...

   12de86387f
3. 
   gmaxwell commented at 8:02 am on December 12, 2016: contributor

   Fixes #432
4. 
   sipa commented at 6:56 pm on December 12, 2016: contributor

   utACK 12de86387f302140ab87d73c555ff1b3ffae1c20
5. sipa merged this on Dec 12, 2016
6. sipa closed this on Dec 12, 2016

   ---

7. sipa referenced this in commit 8225239f49 on Dec 12, 2016
8. apoelstra cross-referenced this on Dec 14, 2016 from issue Cannot build on Debian stretch by possientis
9. gmaxwell cross-referenced this on Feb 17, 2017 from issue configure should check for opacity of ECDSA_SIG and not use the openssl tests if it's opaque by gmaxwell
10. g1itch cross-referenced this on Dec 11, 2019 from issue Fix build with openssl-1.1 by g1itch

Contributors
gmaxwell sipa