tree-wide: Sort includes

This was done by running a locally built clang-format with
https://github.com/llvm/llvm-project/pull/137617 and
https://github.com/llvm/llvm-project/pull/137840 applied on all .c
and .h files.

src/import/import-fs.c

@@ -5,8 +5,8 @@
 
 #include "alloc-util.h"
 #include "ansi-color.h"
-#include "build.h"
 #include "btrfs-util.h"
+#include "build.h"
 #include "discover-image.h"
 #include "fd-util.h"
 #include "format-util.h"