* Fix PAL_JitWriteProtect export on Linux

I have not realized that we actually export that symbol on Linux too and
that mscordac then have the dummy function missing.

* Code review feedback

* Disable PAL_JitWriteEnable usage in DBI / DAC

* Fix typo in amd64 version
Co-authored-by: NMike McLaughlin <mikem@microsoft.com>