[Background]
The UnixPkg provide an simulator in *unix. To support source level debug, we need force all modules be built as ELF shard objects and dynamically load all of modules using dlopen(). For peicore, peim and dxecore, we provide a wrapper to provide PeCoffLoader interface
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5382 6f19259b-4bc3-4df7-8a09-765794883524