Fix macOS: Dynamically Detect Homebrew-installed GSSAPI Library

Problem:

On macOS, the GSSAPI library path is hardcoded as /usr/lib/libgssapi_krb5.dylib. However, when installed via Homebrew, the library is located in /opt/homebrew/lib/libgssapi_krb5.dylib (or /usr/local/lib/... for Intel Macs).

This causes ffi_lib to fail unless the user manually modifies the path.

Solution:

• Used File.exist? to check if the Homebrew-installed library exists.
• If found, used brew --prefix to dynamically get the correct path.
• Falls back to /usr/lib/libgssapi_krb5.dylib if Homebrew is not installed.

Code Changes:

Updated lib_gssapi_loader.rb to:

when /darwin/
  brew_prefix = `brew --prefix`.strip rescue nil
  gssapi_lib = if brew_prefix && !brew_prefix.empty?
                  "#{brew_prefix}/lib/libgssapi_krb5.dylib"
               else
                  "/usr/lib/libgssapi_krb5.dylib"
               end
  ffi_lib gssapi_lib, FFI::Library::LIBC