FindOpenSSL: add target OpenSSL::applink to support OpenSSL's applink feature

Fixes: #20701
5 jobs for !4737 with master in 5 minutes and 24 seconds (queued for 1 second)
detached
Status Name Job ID Coverage
  Build
passed build:debian10-iwyu #4952083
build docker linux

00:03:32

failed build:fedora31-sphinx #4952085
build docker linux linux-3.17

00:05:23

passed build:fedora31-tidy #4952084
build docker linux

00:04:05

 
  External
passed cdash

passed ghostflow-check-master

 
Name Stage Failure
failed
build:fedora31-sphinx Build
   SubmitURL: http://open.cdash.org/submit.php?project=CMake
Upload file: /builds/gitlab-kitware-cmake ci/Utilities/Sphinx/build/Testing/20200514-0250/Build.xml to http://open.cdash.org/submit.php?project=CMake&FileName=gitlab-ci___cmake-fedora31_sphinx___20200514-0250-merge-requests___XML___Build.xml&build=cmake-fedora31_sphinx&site=gitlab-ci&stamp=20200514-0250-merge-requests&MD5=55f7c67a21f14fbe272548781dc3a1fb Size: 2073
Uploaded: /builds/gitlab-kitware-cmake ci/Utilities/Sphinx/build/Testing/20200514-0250/Build.xml
Submission successful
CMake Error at /builds/gitlab-kitware-cmake ci/.gitlab/ci/ctest_build.cmake:28 (message):
Found 1 warnings (treating as fatal).


ERROR: Job failed: exit code 1