fix(native_comp): crash on launch when gcc homebrew package was not installed

It turns out all *.eln files link against the libgcc dylib in homebrew:

    /usr/local/lib/gcc/11/libgcc_s.1.dylib

So here we find all *.eln files in all relevant paths they may be
depending on how old of a native-comp source tree we're building, and
copy in any shared libs that resides within the homebrew prefix. Just
like we do for all other binaries that we copy libs for.

build-emacs-for-macos

@@ -652,11 +652,35 @@ class LibEmbedder < AbstractEmbedder
     FileUtils.cd(File.dirname(app)) do
       copy_libs(binary)
       copy_extra_libs(extra_libs, binary) if extra_libs.any?
+      if eln_files.any?
+        info "Embedding libraries for #{eln_files.size} *.eln files " \
+             'within Emacs.app'
+        rel_path = Pathname.new(lib_dir).relative_path_from(
+          Pathname.new(File.dirname(binary))
+        ).to_s
+        eln_files.each { |f| copy_libs(f, rel_path) }
+      end
     end
   end
 
   private
 
+  def eln_files
+    @eln_files ||= Dir[
+      File.join(
+        app, 'Contents', 'Resources', 'native-lisp', '**', '*.eln'
+      ),
+      File.join(
+        app, 'Contents', 'MacOS', 'lib', 'emacs', '**',
+        'native-lisp', '**', '*.eln'
+      ),
+      File.join(
+        app, 'Contents', 'MacOS', 'libexec', 'emacs', '**',
+        'eln-cache', '**', '*.eln'
+      )
+    ]
+  end
+
   def copy_libs(exe, rel_path = nil)
     exe_file = File.basename(exe)
     rel_path ||= Pathname.new(lib_dir).relative_path_from(