Create instance of DynamicLoaderPOSIXDYLD on NetBSD

[krytarowski]

Summary

NetBSD is a modern ELF UNIX-like system.

There is requires DynamicLoaderPOSIXDYLD e.g. for ELF AUXV reading from the client.

Sponsored by <The NetBSD Foundation>

[labath]

I think you should group these "add netbsd to a list" type of changes into single diff. There's not point in reviewing each separately.

[krytarowski]

This approach is easier for my to understand each change and make sure that it's actually needed and correct (or looking like a proper solution).
There are 2 similar changes left I don't fully understand and code interfering with the OpenBSD platform addition that I will hold on a while.

I expect that FreeBSD/OpenBSD (and perhaps DragonflyBSD at some point) will have the job clearer.

source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp

 uint32_t DynamicLoaderPOSIXDYLD::GetPluginVersion() { return 1; }
 
 DynamicLoader *DynamicLoaderPOSIXDYLD::CreateInstance(Process *process,
                                                       bool force) {
   bool create = force;
   if (!create) {
     const llvm::Triple &triple_ref =
         process->GetTarget().GetArchitecture().GetTriple();
-    if (triple_ref.getOS() == llvm::Triple::Linux ||
-        triple_ref.getOS() == llvm::Triple::FreeBSD)
+    if (triple_ref.getOS() == llvm::Triple::FreeBSD ||
+        triple_ref.getOS() == llvm::Triple::Linux ||
+        triple_ref.getOS() == llvm::Triple::NetBSD)
       create = true;
   }
 
   if (create)
     return new DynamicLoaderPOSIXDYLD(process);
   return NULL;
 }