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/cmVSSetupHelper.h

@@ -4,7 +4,7 @@
 #define cmVSSetupHelper_h
 
 #ifndef NOMINMAX
-#define NOMINMAX // Undefine min and max defined by windows.h
+#  define NOMINMAX // Undefine min and max defined by windows.h
 #endif
 
 // Published by Visual Studio Setup team
@@ -97,6 +97,7 @@ public:
   operator BSTR() const { return str; }
   BSTR* operator&() throw() { return &str; }
   ~SmartBSTR() throw() { ::SysFreeString(str); }
+
 private:
   BSTR str;
 };