[llvm-objcopy] Use ELFOSABI_NONE instead of 0. NFC.

This was requested during the review of D55886.
(sorry, forgot to address this)

llvm-svn: 349741
diff --git a/llvm/tools/llvm-objcopy/ELF/Object.cpp b/llvm/tools/llvm-objcopy/ELF/Object.cpp
index dab0b9f..39794a3 100644
--- a/llvm/tools/llvm-objcopy/ELF/Object.cpp
+++ b/llvm/tools/llvm-objcopy/ELF/Object.cpp
@@ -703,7 +703,7 @@
 template <class ELFT> void BinaryELFBuilder<ELFT>::initFileHeader() {
   Obj->Flags = 0x0;
   Obj->Type = ET_REL;
-  Obj->OSABI = 0;
+  Obj->OSABI = ELFOSABI_NONE;
   Obj->ABIVersion = 0;
   Obj->Entry = 0x0;
   Obj->Machine = EMachine;