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.h

@@ -8,17 +8,17 @@
 #include <string>
 
 #if defined(_WIN32)
-#include <windows.h> // HANDLE
+#  include <windows.h> // HANDLE
 #endif
 
 class cmFileLockResult;
 
 /**
-  * @brief Cross-platform file locking.
-  * @details Under the hood this class use 'fcntl' for Unix-like platforms and
-  * 'LockFileEx'/'UnlockFileEx' for Win32 platform. Locks are exclusive and
-  * advisory.
-  */
+ * @brief Cross-platform file locking.
+ * @details Under the hood this class use 'fcntl' for Unix-like platforms and
+ * 'LockFileEx'/'UnlockFileEx' for Win32 platform. Locks are exclusive and
+ * advisory.
+ */
 class cmFileLock
 {
   CM_DISABLE_COPY(cmFileLock)
@@ -28,21 +28,21 @@ public:
   ~cmFileLock();
 
   /**
-    * @brief Lock the file.
-    * @param timeoutSec Lock timeout. If -1 try until success or fatal error.
-    */
+   * @brief Lock the file.
+   * @param timeoutSec Lock timeout. If -1 try until success or fatal error.
+   */
   cmFileLockResult Lock(const std::string& filename, unsigned long timeoutSec);
 
   /**
-    * @brief Unlock the file.
-    */
+   * @brief Unlock the file.
+   */
   cmFileLockResult Release();
 
   /**
-    * @brief Check file is locked by this class.
-    * @details This function helps to find double locks (deadlocks) and to do
-    * explicit unlocks.
-    */
+   * @brief Check file is locked by this class.
+   * @details This function helps to find double locks (deadlocks) and to do
+   * explicit unlocks.
+   */
   bool IsLocked(const std::string& filename) const;
 
 private: