package/ace: fix build with libressl >= 3.5.0

Fix the following build failure with libressl raised since bump to
version 3.5.2 in commit 8b216927:

/tmp/instance-17/output-1/build/ace-7.0.6/ace/SSL/SSL_Asynch_BIO.cpp:45:19: error: variable 'BIO_METHOD methods_ACE' has initializer but incomplete type
   45 | static BIO_METHOD methods_ACE =
      |                   ^~~~~~~~~~~

Fixes:
 - http://autobuild.buildroot.org/results/7f40d6dde03134238151c248fbbd66e4713546cb



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>