libcutils: Work around the lack of __mulodi4

The parent change ran into an issue where enabling UBSan on an i686
build caused it to use __mulodi4.

https://github.com/android-ndk/ndk/issues/184 documents linking against
libclang_rt.builtins-i686.a, but that's not available from soong either.

Bug: 62378620
Bug: 29412086
Test: x86 builds work again
Change-Id: I730d59558aa4ed28f8a11b5393e037111e320f29