Improve error message for ModuleNameMismatch error and add regression test.

[taimoorzaeem]

Fixes issue #1253.

[RyanGlScott]

Thanks, @taimoorzaeem.

The CI is failing on Windows because the error message is printing out a relative path, which displays as [error] ./issue1253b.cry:1:8--1:11: on macOS and Linux but [error] .\issue1253b.cry:1:8--1:11: on Windows (note the backslash instead of the forward slash). You should be able to resolve this issue by checking in a separate tests/issues/issue1253.icry.stdout.mingw32 file that uses a backslash instead of a forward slash, which the test suite will use only on Windows.