Revise C++ coding style using clang-format-6.0

Run the `clang-format.bash` script to update all our C and C++ code to a
new style defined by `.clang-format`.  Use `clang-format` version 6.0.

* If you reached this commit for a line in `git blame`, re-run the blame
  operation starting at the parent of this commit to see older history
  for the content.

* See the parent commit for instructions to rebase a change across this
  style transition commit.

Source/cmFindPackageCommand.h

@@ -22,7 +22,7 @@ namespace std {
 }
 /* clang-format on */
 #else
-#include <functional>
+#  include <functional>
 #endif
 
 #include "cmFindCommon.h"