This reverts commit 3e9b79ff.

Reason for revert: Android does not allow CoW mappings to be EXEC because it assumes they are text relocations (when selinux enforcing

Change-Id: I1227a2caa18bdad1a46873e4ec420a83cb21821b
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/52630
Presubmit-Ready: Jason Macnak <natsu@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Commit-Queue: Jason Macnak <natsu@google.com>
Tested-by: Jason Macnak <natsu@google.com>