fatal error: 'js-config.h' file not found

Hello, I'm the maintainer of mongodb in MacPorts, trying to update our port from 3.0.8 to 3.2.3.

3.0.8 built fine for i386 and x86_64. 3.2.3 builds fine for x86_64 but fails as follows for i386:

In file included from <built-in>:349:

<command line>:10:10: fatal error: 'js-config.h' file not found

#include "js-config.h"

         ^

1 error generated.

Indeed, the file src/third_party/mozjs-38/platform/x86_64/osx/include/js-config.h exists, while the entire directory src/third_party/mozjs-38/platform/i386/osx is missing.

The release notes for 3.2 say "Starting in 3.2, 32-bit binaries are deprecated and will be unavailable in future releases." This implies 32-bit builds should still be possible with 3.2.x.