Fix compilation with the Oracle / Sun compiler (#15318)

One piece of code has some ambiguous type deduction that seems to
resolve correctly for most compilers but not for the Oracle compiler.
Make it more explicit.

Source/cmComputeLinkDepends.cxx

@@ -266,9 +266,10 @@ cmComputeLinkDepends::Compute()
   // Iterate in reverse order so we can keep only the last occurrence
   // of a shared library.
   std::set<int> emmitted;
+  const std::vector<int>& cFLO = this->FinalLinkOrder;
   for(std::vector<int>::const_reverse_iterator
-        li = this->FinalLinkOrder.rbegin(),
-        le = this->FinalLinkOrder.rend();
+        li = cFLO.rbegin(),
+        le = cFLO.rend();
       li != le; ++li)
     {
     int i = *li;