Add missing <cctype> include, from Joerg Sonnenberger

llvm-svn: 123668

clang/tools/driver/driver.cpp

@@ -35,6 +35,7 @@
 #include "llvm/Support/Program.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/system_error.h"
+#include <cctype>
 using namespace clang;
 using namespace clang::driver;