Add missing <iterator> include for std::inserter

Bug: b/175635923
Test: treehugger
Change-Id: I241c8b2b48bb4c616fbc5b4ae1285e274182144b

cmds/idmap2/libidmap2/CommandLineOptions.cpp

@@ -19,6 +19,7 @@
 #include <algorithm>
 #include <cassert>
 #include <iomanip>
+#include <iterator>
 #include <memory>
 #include <ostream>
 #include <set>