[elfabi] Fix the type of the variable formated for error output

[mstojanovic]

Summary

Change the format type of Dyn.SONameOffset to PRIx64 since it is a uint64_t.
The problem was detected on mips builds, where it was printing junk values and causing test failure.

[jhenderson]

LGTM.

llvm/trunk/tools/llvm-elfabi/ELFObjHandler.cpp

static Error populateDynamic(DynamicEntries &Dyn,
   }
   if (!FoundDynSym) {
     return createError(
         "Couldn't locate dynamic symbol table (no DT_SYMTAB entry)");
   }
   if (Dyn.SONameOffset.hasValue() && *Dyn.SONameOffset >= Dyn.StrSize) {
     return createStringError(
         object_error::parse_failed,
-        "DT_SONAME string offset (0x%016x) outside of dynamic string table",
+        "DT_SONAME string offset (0x%016" PRIx64
+        ") outside of dynamic string table",
         *Dyn.SONameOffset);
   }
   for (uint64_t Offset : Dyn.NeededLibNames) {
     if (Offset >= Dyn.StrSize) {
       return createStringError(
           object_error::parse_failed,
-          "DT_NEEDED string offset (0x%016x) outside of dynamic string table",
+          "DT_NEEDED string offset (0x%016" PRIx64
+          ") outside of dynamic string table",
           Offset);
     }
   }
 
   return Error::success();
 }
 
 /// This function finds the number of dynamic symbols using a GNU hash table.