openssl@3: fix OPENSSL_LIBRARY_DIR in OpenSSLConfig.cmake

[cho-m]

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OpenSSL 3.3 introduced CMake files, but the installed file's OPENSSL_LIBRARY_DIR is wrong:

# Directories and names
set(OPENSSL_INCLUDE_DIR "${_ossl_prefix}/include")
set(OPENSSL_LIBRARY_DIR "${_ossl_prefix}/.")
set(OPENSSL_ENGINES_DIR "${_ossl_prefix}/lib/engines-3")
set(OPENSSL_MODULES_DIR "${_ossl_prefix}/lib/ossl-modules")
set(OPENSSL_RUNTIME_DIR "${_ossl_prefix}/bin")

This looks like due to using an absolute path for --libdir. Documentation says:

### libdir

    --libdir=DIR

The name of the directory under the top of the installation directory tree
(see the `--prefix` option) where libraries will be installed.  By default
this is `lib`. Note that on Windows only static libraries (`*.lib`) will
be stored in this location. Shared libraries (`*.dll`) will always be
installed to the `bin` directory.

Some build targets have a multilib postfix set in the build configuration.
For these targets the default libdir is `lib<multilib-postfix>`. Please use
`--libdir=lib` to override the libdir if adding the postfix is undesirable.

Seen in snappy PR which fails to build libpulsar due to wrong path (partly as a side effect of setting -DCMAKE_FIND_PACKAGE_PREFER_CONFIG=ON so new CMake config is used rather than module) - https://github.com/Homebrew/homebrew-core/actions/runs/8778078486/job/24084058696?pr=168100#step:3:195

  OPENSSL_INCLUDE_DIR: /opt/homebrew/include
  OPENSSL_LIBRARIES: /opt/homebrew/./libssl.dylib

[carlocab]

Possibly related: #169728

[cho-m]

dura and git-series have unrelated failures due to Homebrew/brew#17116

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