build: detect and include inttypes.h again

For `PRI*` printf masks for fixed-size C99 types.

Also:
- add simple fallback for `PRIu32`, `PRIx32`, if `inttypes.h` is
  missing.

Cherry-picked from #20200
Ref: #20207
Follow-up to 4701a6d2ae #19695
Ref: 60359ad504 #12275
Closes #20208

lib/config-os400.h

@@ -96,6 +96,9 @@
 /* Define if you have the `timeval' struct. */
 #define HAVE_STRUCT_TIMEVAL
 
+/* Define if you have the <inttypes.h> header file. */
+#define HAVE_INTTYPES_H
+
 /* Define if you have the <io.h> header file. */
 #undef HAVE_IO_H
 

lib/config-plan9.h

@@ -83,6 +83,7 @@
 #define HAVE_GMTIME_R 1
 #define HAVE_INET_NTOP 1
 #define HAVE_INET_PTON 1
+#define HAVE_INTTYPES_H 1
 #define HAVE_LIBGEN_H 1
 #define HAVE_LIBZ 1
 #define HAVE_LOCALE_H 1

lib/config-riscos.h

@@ -96,6 +96,9 @@
 /* Define if you have the `timeval' struct. */
 #define HAVE_STRUCT_TIMEVAL
 
+/* Define if you have the <inttypes.h> header file. */
+#define HAVE_INTTYPES_H
+
 /* Define if you have the <io.h> header file. */
 #undef HAVE_IO_H
 

lib/config-win32.h

@@ -82,6 +82,11 @@
 /* Define if you have the <fcntl.h> header file. */
 #define HAVE_FCNTL_H 1
 
+/* Define to 1 if you have the <inttypes.h> header file. */
+#if (defined(_MSC_VER) && (_MSC_VER >= 1800)) || defined(__MINGW32__)
+#define HAVE_INTTYPES_H 1
+#endif
+
 /* Define if you have the <io.h> header file. */
 #define HAVE_IO_H 1
 

lib/curl_config-cmake.h.in

@@ -336,6 +336,9 @@
 /* Define to 1 if symbol `sa_family_t' exists */
 #cmakedefine HAVE_SA_FAMILY_T 1
 
+/* Define to 1 if you have the <inttypes.h> header file. */
+#cmakedefine HAVE_INTTYPES_H 1
+
 /* Define to 1 if you have the ioctlsocket function. */
 #cmakedefine HAVE_IOCTLSOCKET 1
 

lib/curl_setup.h

@@ -464,6 +464,13 @@
 
 #include <limits.h>
 
+#ifdef HAVE_INTTYPES_H
+#include <inttypes.h>
+#else
+#define PRIu32 "u"
+#define PRIx32 "x"
+#endif
+
 #ifdef _WIN32
 #  ifdef HAVE_IO_H
 #  include <io.h>