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9.19 inttypes.h

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/inttypes.h.html

Gnulib module: inttypes

Portability problems fixed by Gnulib:

• This header file is missing on some platforms: MSVC 9.
• This header file is very incomplete on some platforms.
• The declarations of imaxabs and imaxdiv are missing on some platforms: NetBSD 3.0, OpenBSD 6.7, AIX 5.1, HP-UX 11.
• The declarations of strtoimax and strtoumax are missing on some platforms: OpenBSD 6.7, AIX 5.1 (missing only strtoumax).
• On some hosts that predate C++11, when using C++ one must define __STDC_FORMAT_MACROS to make visible the declarations of format macros such as PRIdMAX.

Portability problems not fixed by Gnulib:

• The PRIb*, PRIB*, SCNb* macros, that were added in ISO C 23, are missing on many platforms: glibc 2.37 and many others.