Ryan Scott authored Nov 13, 2019 and Marge Bot committed Nov 23, 2019

This reverts a part of commit
7bc5d6c6 that causes all arguments
to `-optc` (and `-optcxx`) to be passed twice to the C/C++ compiler,
once in reverse order and then again in the correct order. While
passing duplicate arguments is usually harmless it can cause breakage
in this pattern, which is employed by Hackage libraries in the wild:

```
ghc Foo.hs foo.c -optc-D -optcFOO
```

As `FOO -D -D FOO` will cause compilers to error.

Fixes #17471.