ext(native): work around darwin linker behavior in Ruby 3.2

rake-compiler/rake-compiler-dock#87

ext/sqlite3/extconf.rb

@@ -87,6 +87,13 @@ def configure_packaged_libraries
           end
 
           flags.each { |flag| append_ldflags(flag) }
+
+          # See https://github.com/rake-compiler/rake-compiler-dock/issues/87 for more info.
+          if cross_build? &&
+             darwin? &&
+             Gem::Requirement.new("~> 3.2").satisfied_by?(Gem::Version.new(RbConfig::CONFIG["ruby_version"]))
+            append_ldflags("-Wl,-flat_namespace")
+          end
         end
       end
 
@@ -172,6 +179,10 @@ def download
         minimal_recipe.download
       end
 
+      def darwin?
+        RbConfig::CONFIG["target_os"].include?("darwin")
+      end
+
       def print_help
         print(<<~TEXT)
           USAGE: ruby #{$PROGRAM_NAME} [options]