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/cmExportCommand.cxx

@@ -20,8 +20,8 @@
 class cmExecutionStatus;
 
 #if defined(__HAIKU__)
-#include <FindDirectory.h>
-#include <StorageDefs.h>
+#  include <FindDirectory.h>
+#  include <StorageDefs.h>
 #endif
 
 cmExportCommand::cmExportCommand()
@@ -266,7 +266,7 @@ bool cmExportCommand::HandlePackage(std::vector<std::string> const& args)
 }
 
 #if defined(_WIN32) && !defined(__CYGWIN__)
-#include <windows.h>
+#  include <windows.h>
 
 void cmExportCommand::ReportRegistryError(std::string const& msg,
                                           std::string const& key, long err)
@@ -317,7 +317,7 @@ void cmExportCommand::StorePackageRegistryDir(std::string const& package,
                                               const char* content,
                                               const char* hash)
 {
-#if defined(__HAIKU__)
+#  if defined(__HAIKU__)
   char dir[B_PATH_NAME_LENGTH];
   if (find_directory(B_USER_SETTINGS_DIRECTORY, -1, false, dir, sizeof(dir)) !=
       B_OK) {
@@ -326,7 +326,7 @@ void cmExportCommand::StorePackageRegistryDir(std::string const& package,
   std::string fname = dir;
   fname += "/cmake/packages/";
   fname += package;
-#else
+#  else
   std::string fname;
   if (!cmSystemTools::GetEnv("HOME", fname)) {
     return;
@@ -334,7 +334,7 @@ void cmExportCommand::StorePackageRegistryDir(std::string const& package,
   cmSystemTools::ConvertToUnixSlashes(fname);
   fname += "/.cmake/packages/";
   fname += package;
-#endif
+#  endif
   cmSystemTools::MakeDirectory(fname);
   fname += "/";
   fname += hash;