To load ttf on Android, you have to store it in your APK uncompressed. I don't really know why yet, it's possibly a bug in Allegro but everything else loads fine. The "best" way I found to do that was to give it one of the "supported" extensions (this is really ridiculous, but that's the way it seems to be.) Then you have to open the file with al_fopen after setting the apk file interface, and load the ttf with al_load_ttf_font_f. This is sort of explained here, with the list of file extensions you can use (I know it's crazy, but my ttfs have a .gif extension android.)

http://ponystyle.com/blog/2010/03/26/dealing-with-asset-compression-in-android-apps/

The other way to do it is to use a lower SDK, but Allegro's increase the minimum Android version to 2.3... so I don't know if that's possible. You would then use the <aapt> section from the bottom of the project.properties file found in the last 5.1.x source release (or back in git history.)

It stopped working because that bit I mentioned in the last paragraph from project.properties was removed because it was incompatible with the 2.3+ SDK. There might be a way to fix that and add it back, but in the end I think it's better not to. Without it, your APK gets compressed which is a good thing.