Revert "Fix undefined GHC.Real export with integer-simple"

Authored by austin.

Description

Revert "Fix undefined GHC.Real export with integer-simple"

This reverts commit 228902aa4a3350a9c99e421c0c989c7de794b7b6.

This commit is dependent on d6e7f5dc9db7e382ce34d649f85505176a451a04,
which broke the build on Windows (issue Trac #9945).