Revert "stdlib.h: Fix qsort_r compatibility with GCC 12."

[jhb]

Summary

This reverts commit 43703bc489ec504b947b869045c492ed38c1a69c.

[jrtc27]

I think these can come in either order and break each other regardless? If so might be tempted to revert first.

[jhb]

In D38216#868503, @jrtc27 wrote:

I think these can come in either order and break each other regardless? If so might be tempted to revert first.

Oh right, I guess it does break both ways. I had reverted first locally actually to make sure I could reproduce the breakage before testing the cdefs.h change. I can commit them in that order (revert first).