Delete unittest CI step

- There are no unittests in the source files, so this was meaningless.

- It would be meaningful to perform a syntax check here.
  `dub build --build=syntax` would be a good fit, but it does not seem
  to pass `.di` files to the compiler.

.github/workflows/ci.yml

@@ -140,7 +140,6 @@ jobs:
         # We don't checkout in $GITHUB_WORKSPACE to avoid polluting the repository with artifacts,
         # e.g. the C openssl library or Vibe.d
         cd ${{ github.workspace }}/deimos-openssl/
-        dub test
         cd examples/sslecho/
         ${{ github.workspace }}/openssl/install/bin/openssl req -batch -newkey rsa:4096 -x509 -sha256 -days 3650 -subj "/C=GB/CN=localhost" -nodes -out cert.pem -keyout key.pem
         dub build

dub.sdl

@@ -21,12 +21,3 @@ configuration "library-manual-version" {
 configuration "library-applink" {
 	targetType "sourceLibrary"
 }
-
-configuration "unittest" {
-	targetType "executable"
-	targetName "openssl-test-library"
-	dflags "-main"
-	excludedSourceFiles "source/deimos/openssl/applink.d"
-	preGenerateCommands `${DUB} scripts/generate_version.d` platform="posix"
-	versions `DeimosOpenSSLAutoDetect`
-}