Disable usage of OpenSSL

`OpenSSL` is used via `HsOpenSSL` which currently cannot be built if the
version of GCC being used by GHC is >= 14.2 and even if that were
fixed, `HsOpenSSL` is likely to break again in early 2025:

    haskell-cryptography/HsOpenSSL#95

Finally, `openssl` support is only needed if `cardano-node` is compiled
with the `+rtview` flag, which is not the case for `db-sync`.

Author: erikd

cabal.project

@@ -63,7 +63,9 @@ test-show-details: direct
 write-ghc-environment-files: always
 
 package snap-server
-  flags: +openssl
+  -- This flag is only needed for a component of `cardano-node` and then
+  -- only if the `cardano-node` is compiled with `+rtview`.
+  flags: -openssl
 
 allow-newer:
   swagger2:aeson