Missing modules in `exposed-modules` and linker errors

**Describe the bug**

Related: #1746

I recently have [helped a user](https://discourse.haskell.org/t/cryptic-error-when-running-cabal-run-for-the-first-time/6119) with a well know error, forgetting to put modules in `exposed-modules` (edit: actually, `other-modules`, but it is the same problem).

What we know:
- a `-Wmissing-home-modules` warning gets printed.
- The user is clearly not a newbie.

The hint got probably overlooked because of the barrage of abuse by the linker

```
⁝
/tmp/aura_lang/dist-newstyle/build/x86_64-linux/ghc-9.2.1/aura-lang-0.1.0.0/build/libHSaura-lang-0.1.0.0-inplace.a(Parser.o)(.text+0x9406): error: undefined reference to 'aurazmlangzm0zi1zi0zi0zminplace_Syntax_zdWMapLiteral_info'
/tmp/aura_lang/dist-newstyle/build/x86_64-linux/ghc-9.2.1/aura-lang-0.1.0.0/build/libHSaura-lang-0.1.0.0-inplace.a(Parser.o)(.text+0x9496): error: undefined reference to 'aurazmlangzm0zi1zi0zi0zminplace_Syntax_zdWIdentifier_info'
/tmp/aura_lang/dist-newstyle/build/x86_64-linux/ghc-9.2.1/aura-lang-0.1.0.0/build/libHSaura-lang-0.1.0.0-inplace.a(Parser.o)(.text+0xaf16): error: undefined reference to 'aurazmlangzm0zi1zi0zi0zminplace_Syntax_zdWStringLiteral_info'
/tmp/aura_lang/dist-newstyle/build/x86_64-linux/ghc-9.2.1/aura-lang-0.1.0.0/build/libHSaura-lang-0.1.0.0-inplace.a(Parser.o)(.text+0xb43e): error: undefined reference to 'aurazmlangzm0zi1zi0zi0zminplace_Syntax_zdWCharLiteral_info'
/tmp/aura_lang/dist-newstyle/build/x86_64-linux/ghc-9.2.1/aura-lang-0.1.0.0/build/libHSaura-lang-0.1.0.0-inplace.a(Parser.o)(.text+0xbab0): error: undefined reference to 'aurazmlangzm0zi1zi0zi0zminplace_Lexer_boolean1_info'
/tmp/aura_lang/dist-newstyle/build/x86_64-linux/ghc-9.2.1/aura-lang-0.1.0.0/build/libHSaura-lang-0.1.0.0-inplace.a(Parser.o)(.data+0xbd8): error: undefined reference to 'aurazmlangzm0zi1zi0zi0zminplace_Lexer_variable_closure'
/tmp/aura_lang/dist-newstyle/build/x86_64-linux/ghc-9.2.1/aura-lang-0.1.0.0/build/libHSaura-lang-0.1.0.0-inplace.a(Parser.o)(.data+0xbe8): error: undefined reference to 'aurazmlangzm0zi1zi0zi0zminplace_Lexer_comma1_closure'
/tmp/aura_lang/dist-newstyle/build/x86_64-linux/ghc-9.2.1/aura-lang-0.1.0.0/build/libHSaura-lang-0.1.0.0-inplace.a(Parser.o)(.data+0x11a0): error: undefined reference to 'aurazmlangzm0zi1zi0zi0zminplace_Lexer_boolean1_closure'
/tmp/aura_lang/dist-newstyle/build/x86_64-linux/ghc-9.2.1/aura-lang-0.1.0.0/build/libHSaura-lang-0.1.0.0-inplace.a(Parser.o)(.data+0x1458): error: undefined reference to 'aurazmlangzm0zi1zi0zi0zminplace_Lexer_arrow1_closure'
⁝
```

*and* the fact that warnings are not displayed again on a new `cabal run`.

**Expected behavior**

The user notices the error, is able to understand it and fix it by themselves.

I would not know precisely what to suggest though: upgrading the warning to error could be annoying to a number of developers. Redirecting linker output somewhere too could break some dev setups.

**To reproduce**

Create a lib/exe `.cabal`, forget to expose a module in the lib that is needed by the exe.