Last attempt didn't work out because it inadvertently removed the
ASSETCATALOG_COMPILER_APPICON_NAME from the xcodeproj.
This reverts commit c65cc4bfa78382884a3a02c1b4391597a71a0568.
Turns out Apple makes it way too hard to actually upload an app with
alternate icons. Reverting this so it doesn't block releasing the next
build.
This reverts commit 4d3f8ce2528acfc6b716cc2e9a9bc0fc9e38b39b.