Format include directive blocks and ordering with clang-format

Sort include directives within each block (separated by a blank line) in
lexicographic order (except to prioritize `sys/types.h` first).  First
run `clang-format` with the config file:

    ---
    SortIncludes: false
    ...

Commit the result temporarily.  Then run `clang-format` again with:

    ---
    SortIncludes: true
    IncludeCategories:
      - Regex:    'sys/types.h'
        Priority: -1
    ...

Commit the result temporarily.  Start a new branch and cherry-pick the
second commit.  Manually resolve conflicts to preserve indentation of
re-ordered includes.  This cleans up the include ordering without
changing any other style.

Use the following command to run `clang-format`:

    $ git ls-files -z -- \
        '*.c' '*.cc' '*.cpp' '*.cxx' '*.h' '*.hh' '*.hpp' '*.hxx' |
      egrep -z -v '(Lexer|Parser|ParserHelper)\.' |
      egrep -z -v '^Source/cm_sha2' |
      egrep -z -v '^Source/(kwsys|CursesDialog/form)/' |
      egrep -z -v '^Utilities/(KW|cm).*/' |
      egrep -z -v '^Tests/Module/GenerateExportHeader' |
      egrep -z -v '^Tests/RunCMake/CommandLine/cmake_depends/test_UTF-16LE.h' |
      xargs -0 clang-format -i

This selects source files that do not come from a third-party.

Inspired-by: Daniel Pfeifer <daniel@pfeifer-mail.de>

3 files changed, 4 insertions, 4 deletions

diff --git a/Tests/BuildDepends/Project/bar.cxx b/Tests/BuildDepends/Project/bar.cxx
index dadf93d..c4adbf8 100644
--- a/Tests/BuildDepends/Project/bar.cxx
+++ b/Tests/BuildDepends/Project/bar.cxx
@@ -1,7 +1,7 @@
+#include <noregen.h>
+#include <regen.h>
 #include <stdio.h>
 #include <string.h>
-#include <regen.h>
-#include <noregen.h>
 
 int main(int argc, char** argv)
 {
diff --git a/Tests/BuildDepends/Project/ninjadep.cpp b/Tests/BuildDepends/Project/ninjadep.cpp
index 8d61336..5498b17 100644
--- a/Tests/BuildDepends/Project/ninjadep.cpp
+++ b/Tests/BuildDepends/Project/ninjadep.cpp
@@ -1,5 +1,5 @@
-#include <stdio.h>
 #include "dir/header.h"
+#include <stdio.h>
 
 int main() {
   printf("HEADER_STRING: %s\n", HEADER_STRING);
diff --git a/Tests/BuildDepends/Project/zot.cxx b/Tests/BuildDepends/Project/zot.cxx
index 775fd3b..186554b 100644
--- a/Tests/BuildDepends/Project/zot.cxx
+++ b/Tests/BuildDepends/Project/zot.cxx
@@ -1,6 +1,6 @@
+#include <stdio.h>
 #include <zot.hxx>
 #include <zot_custom.hxx>
-#include <stdio.h>
 
 const char* zot_macro_dir_f();
 const char* zot_macro_tgt_f();