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/cmFileLock.cxx

@@ -54,7 +54,7 @@ bool cmFileLock::IsLocked(const std::string& filename) const
 }
 
 #if defined(_WIN32)
-#include "cmFileLockWin32.cxx"
+#  include "cmFileLockWin32.cxx"
 #else
-#include "cmFileLockUnix.cxx"
+#  include "cmFileLockUnix.cxx"
 #endif