What files can be safely deleted from the MinGW-w64 binaries?

I am using the MinGW-w64 installer found here:
https://mingw-w64.org/doku.php/download/mingw-builds

Installing to a directory creates a folder called mingw32 or mingw64 that contains the compiler. I already know that the additional batch script, HTML link, and uninstall executable in the same directory can be deleted.

The mingw32/64 folder contains these folders:

1. bin
2. etc
3. include
4. lib
5. libexec
6. licenses
7. opt
8. share
9. i686-w64-mingw32 (mingw32) or x86_64-w64-mingw32 (mingw64)

I only wish to compile with C and nothing else. So what files can I delete in order to reduce the file count because the compiler contains files for Ruby, Fortran and other languages which as I stated, I don't need it.