At present, the build applies MPROTECT if it can find the tool to do so (8133966). Doing so is only necessary if the build is actually running on a PaX kernel, so we should detect this and avoid https://bugs.gentoo.org/show_bug.cgi?id=54146
            
- relates to
- 
                    JDK-8133966 Allow OpenJDK to build on PaX-enabled kernels -           
- Resolved
 
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