Fix "Undefined symbols for architecture i386" errors when linking against libtasn1

Missing symbols cause linking errors when installing "wine --devel" from a completely fresh homebrew setup, because it requires most of its dependencies to be multi-arch. "brew doctor" runs clean.

This is likely because libtasn1 isn't currently building universal since 6838eab2bd71c47b07192d647be6518eae1170ba

Attached patch fixes the dependency issue, while still allowing libtasn1 to be configured single-arch by default.