Fix cast compiler warning message in include-fixer.

[bkramer]

Looks good, thanks!

clang-tools-extra/trunk/include-fixer/tool/ClangIncludeFixer.cpp

 #include "clang/Rewrite/Core/Rewriter.h"
 #include "clang/Tooling/CommonOptionsParser.h"
 #include "clang/Tooling/Tooling.h"
 #include "llvm/Support/CommandLine.h"
 using namespace clang;
 
 static llvm::cl::OptionCategory tool_options("Tool options");
 
-int main(int argc, char **argv) {
-  clang::tooling::CommonOptionsParser options(argc, (const char **)argv,
-                                              tool_options);
+int main(int argc, const char **argv) {
+  clang::tooling::CommonOptionsParser options(argc, argv, tool_options);
   clang::tooling::ClangTool tool(options.getCompilations(),
                                  options.getSourcePathList());
   // Set up the data source.
   std::map<std::string, std::vector<std::string>> XrefsMap = {
       {"std::string", {"<string>"}}};
   auto XrefsDB =
       llvm::make_unique<include_fixer::InMemoryXrefsDB>(std::move(XrefsMap));