Constant metagoblin::mach::header::MH_NO_HEAP_EXECUTION

pub const MH_NO_HEAP_EXECUTION: u32 = 16777216; // 16_777_216u32

When this bit is set, the OS will run the main executable with a non-executable heap even on platforms (e.g. i386) that don't require it. Only used in MH_EXECUTE filetypes.