badly sorted #include directives

[Ben Pfaff]

gnulib-tool appears to blindly sort the list of #include
directives it prints.  When the list contains #if...#endif, that
makes the output funny, e.g.:

    You may need to add #include directives for the following .h files.
      #endif
      #if HAVE_MBRTOWC
      #if HAVE_WCHAR_H && HAVE_WCTYPE_H
      #include "c-ctype.h"
      #include "c-strtod.h"
      #include "error.h"
      [...]

Of course, it's harmless, but it looks funny.

I don't know whether the problem is in gnulib-tool or the modules
that are sticking conditional inclusion directives in the list of
headers.
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