Support the GNU non-exec stack annotation system
On recent GNU ELF systems one can mark an object file as not requiring an executable stack. If all objects- linked into a program have this note then the program will not use an executable stack, which is good for security (and some distros have it as a QA policy). GHC generated code does not need an executable stack so add the note to the assembly output of the native code generator (conditional on a configure test).
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