Amesos2 does not support Epetra with Tpetra_INST_INT_INT=OFF

Created by: mhoemmen

Bug Report

@trilinos/amesos2 @rppawlo @kddevin

Description

Amesos2 does not support Epetra with Tpetra_INST_INT_INT=OFF.

Steps to Reproduce

1. Set Tpetra_INST_INT_INT=OFF and Amesos2_ENABLE_Epetra=ON
2. Watch Amesos2 complain and fail to implement the feature

This is related to #3234 (closed). That issue was about Amesos2 failing to catch its failure to implement this feature.