[OS/2]: Revert no more needed workarounds for "emxomf: Index too large".

This reverts commit ada5e8e8d72cda17a9ec210fe7008db66a093340,
bfbab9533baa9a69b9093871299b7acc4a640f7e, 911c30fb527f3c357760531c095cf61c0b23fbab.

The libc-devel RPM package version 0.6.5-19 contains the fixed emxomf.exe.