[AggregateTargetInstaller] Ensure static libraries don’t attempt to embed swift stdlib

Because the aggregate target uses the same xcconfig as the user target, we have to disable embedding solely for the target, as it needs to be set to YES in the xcconfig

lib/cocoapods/installer/xcode/pods_project_generator/aggregate_target_installer.rb

@@ -63,6 +63,8 @@ module Pod
               'PODS_ROOT'                          => '$(SRCROOT)',
               'PRODUCT_BUNDLE_IDENTIFIER'          => 'org.cocoapods.${PRODUCT_NAME:rfc1034identifier}',
               'SKIP_INSTALL'                       => 'YES',
+
+              'ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES' => 'NO',
             }
             super.merge(settings)
           end