Brad King 791d4fd350 FindOpenSSL: Prefer OPENSSL_ROOT_DIR only if non-empty ...

Since commit 5cc8a69867 (FindOpenSSL: Trust the user's OPENSSL_ROOT_DIR,
2023-05-17, v3.27.0-rc1~71^2) we use `OPENSSL_ROOT_DIR` whenever it is
defined, even if it is an empty string.  This breaks a pattern in
existing projects that define an empty `OPENSSL_ROOT_DIR` cache entry so
that `cmake-gui` users can fill it in.  Use the value only if non-empty.

Issue: #18352

2023-07-20 12:18:13 -04:00

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