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For context, open/open64 as well as mmap/mmap64 are sometimes seperate pairs of functions but sometimes are just aliased with the preprocessor. A given build of panwrap needs to know this correctly, or otherwise it will either:

• Not compile at all, due to duplicate symbols
• Compile but not trace anything, since it binds the wrong function

The current test in meson is broken. At some point (i.e. before Bifrost), this will need to be fixed.

I suspect a simple check for a 64-bit host may be enough, at least for glibc builds. No idea what bionic does at this point.