Fix apple_static_framework_import with swiftinterface (#753)
Fix apple_static_framework_import with swiftinterface (#753)

Without this when propagating a framework built with library evolution
with apple_static_framework_import it fails because the "swiftmodule"
isn't found. The naming is a bit off here like the function above, but
this now returns whichever of these files exists.
bazelbuild/rules_apple,bazelbuild/rules_apple,bazelbuild/rules_apple,bazelbuild/rules_apple