OpenSSL 1.1.0 compat:

- move IDCONST macro outside of addition #if check.
  Otherwise we break compatibility with old
  OpenSSL 0.9.8 releases.

Backport of r1755856 from trunk.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x-openssl-1.1.0-compat@1755869 13f79535-47bb-0310-9956-ffa450edef68